186 relations: Absorption (electromagnetic radiation), ACRIMSAT, Air mass (astronomy), Alternative fuel, Ancient Egypt, Arabidopsis thaliana, Astronomical unit, Atmosphere, Atmosphere of Earth, Atmosphere of Venus, Autotroph, Awning, Axial tilt, Édouard Manet, Beach, Black-body radiation, Brightness, Cap, Car, Carcinogen, Cataract, Cellular respiration, Charged particle, Chemical energy, Cholecalciferol, Circadian rhythm, Claude Monet, Cloud, Coal, Color temperature, Corona, Coronal radiative losses, Curtain, Daylight, Diathermancy, Diffuse reflection, Diffuse sky radiation, DNA, Dwarf planet, Earth, Effect of Sun angle on climate, Electromagnetic radiation, Electromagnetic spectrum, Elliptic orbit, Extinction (astronomy), Extreme ultraviolet, Flux, Fossil fuel, Fraunhofer lines, Gamma ray, ..., Garden, Genome instability, Germicidal lamp, Heat, Helmet, Heterotroph, Hinduism, Homologous recombination, Horizon, Human eye, Human skin color, Ice age, Illuminance, Immunosuppression, Indoor tanning, Infrared, Inverse-square law, Irradiance, Jupiter, Kelvin, Kepler's laws of planetary motion, Latitude, Leisure, Light, Light therapy, Light-second, Lighting, Limb darkening, List of cities by sunshine duration, Lumen (unit), Luminous efficacy, Lux, Macular degeneration, Malthusian catastrophe, Mars, Mechanistic organic photochemistry, Melanocyte, Melatonin, Mercury (planet), Milankovitch cycles, Millimetre, Moonlight, Mutagen, Nanometre, National Geophysical Data Center, Natural gas, Naturism, Neolithic Revolution, Neptune, Neutrino, New Urbanism, Nicotiana tabacum, Nuclear fusion, Nudity, Nutrient, Optical filter, Orbit, Orbital eccentricity, Organism, Over illumination, Ozone layer, Painting, Paris Observatory, Park, Peak oil, Perihelion and aphelion, Petroleum, Photic retinopathy, Photic sneeze reflex, Photoaging, Photography, Photokeratitis, Photon, Photosynthesis, Planet, Pluto, Poaceae, Prehistory, Primary energy, Psoriasis, PUVA therapy, Pyranometer, Pyrheliometer, Radiance, Radiant energy, Radiant flux, Radical (chemistry), Radio wave, Rayleigh scattering, Reactive oxygen species, Saturn, Season, Seasonal affective disorder, Semi-major and semi-minor axes, Shade (shadow), Shade tree, Sidewalk cafe, Skin cancer, Solar and Heliospheric Observatory, Solar cycle, Solar flare, Solar irradiance, Solar Radiation and Climate Experiment, Solar System, South Pole, Spectral density, Square metre, Standard illuminant, Starlight, Steradian, Sun, Sun tanning, Sunburn, Sunglasses, Sunshine duration, Sunshine recorder, Swimming pool, Thermal radiation, Thom Hartmann, Ultraviolet, Ultraviolet germicidal irradiation, Umbrella, Uranus, Vacation, Venus, Visor, Vitamin D, Wall, Watt, Wavelength, Window blind, Window shutter, World Meteorological Organization, X-ray, Zenith, 90377 Sedna. Expand index (136 more) » « Shrink index
In physics, absorption of electromagnetic radiation is the way in which the energy of a photon is taken up by matter, typically the electrons of an atom.
The Active Cavity Radiometer Irradiance Monitor Satellite, or ACRIMSAT is a defunct satellite and instrument that was one of the 21 observational components of NASA's Earth Observing System program.
In astronomy, air mass (airmass, or AM) is the path length for light from a celestial source to pass through the atmosphere.
Alternative fuels, known as non-conventional and advanced fuels, are any materials or substances that can be used as fuels, other than conventional fuels like; fossil fuels (petroleum (oil), coal, and natural gas), as well as nuclear materials such as uranium and thorium, as well as artificial radioisotope fuels that are made in nuclear reactors.
Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River - geographically Lower Egypt and Upper Egypt, in the place that is now occupied by the countries of Egypt and Sudan.
Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small flowering plant native to Eurasia and Africa.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.
The atmosphere of Venus is the layer of gases surrounding Venus.
An autotroph ("self-feeding", from the Greek autos "self" and trophe "nourishing") or producer, is an organism that produces complex organic compounds (such as carbohydrates, fats, and proteins) from simple substances present in its surroundings, generally using energy from light (photosynthesis) or inorganic chemical reactions (chemosynthesis).
An awning or overhang is a secondary covering attached to the exterior wall of a building.
In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
Édouard Manet (23 January 1832 – 30 April 1883) was a French painter.
A beach is a landform alongside a body of water which consists of loose particles.
Black-body radiation is the thermal electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body (an opaque and non-reflective body).
Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light.
A cap is a form of headgear.
A car (or automobile) is a wheeled motor vehicle used for transportation.
A carcinogen is any substance, radionuclide, or radiation that promotes carcinogenesis, the formation of cancer.
A cataract is a clouding of the lens in the eye which leads to a decrease in vision.
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
In physics, a charged particle is a particle with an electric charge.
In chemistry, chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.
Cholecalciferol, also known as vitamin D3 and colecalciferol, is a type of vitamin D which is made by the skin, found in some foods, and taken as a dietary supplement.
A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours.
Oscar-Claude Monet (14 November 1840 – 5 December 1926) was a founder of French Impressionist painting, and the most consistent and prolific practitioner of the movement's philosophy of expressing one's perceptions before nature, especially as applied to plein air landscape painting.
In meteorology, a cloud is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body.
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams.
The color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of a color comparable to that of the light source.
A corona (Latin, 'crown') is an aura of plasma that surrounds the Sun and other stars.
In astronomy and in astrophysics, for radiative losses of the solar corona, it is meant the energy flux radiated from the external atmosphere of the Sun (traditionally divided into chromosphere, transition region and corona), and, in particular, the processes of production of the radiation coming from the solar corona and transition region, where the plasma is optically-thin.
A curtain (sometimes known as a drape, mainly in the United States) is a piece of cloth intended to block or obscure light, or drafts, or (in the case of a shower curtain) water.
Daylight, or the light of day, is the combination of all direct and indirect sunlight during the daytime.
Diathermancy (from "dia" through and "thermē" heat) is the property of some fluids that allows rays of light through them without itself being heated.
Diffuse reflection is the reflection of light or other waves or particles from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of specular reflection.
Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere.
Deoxyribonucleic acid (DNA) is a thread-like chain of nucleotides carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
The amount of heat energy received at any location on the globe is a direct effect of Sun angle on climate, as the angle at which sunlight strikes the Earth varies by location, time of day, and season due to the Earth's orbit around the Sun and the Earth's rotation around its tilted axis.
In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.
The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
In astrodynamics or celestial mechanics, an elliptic orbit or elliptical orbit is a Kepler orbit with an eccentricity of less than 1; this includes the special case of a circular orbit, with eccentricity equal to 0.
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
Extreme ultraviolet radiation (EUV or XUV) or high-energy ultraviolet radiation is electromagnetic radiation in the part of the electromagnetic spectrum spanning wavelengths from 124 nm down to 10 nm, and therefore (by the Planck–Einstein equation) having photons with energies from 10 eV up to 124 eV (corresponding to 124 nm to 10 nm respectively).
Flux describes the quantity which passes through a surface or substance.
A fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.
In physics and optics, the Fraunhofer lines are a set of spectral lines named after the German physicist Joseph von Fraunhofer (1787–1826).
A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.
A garden is a planned space, usually outdoors, set aside for the display, cultivation and enjoyment of plants and other forms of nature.
Genome instability (also genetic instability or genomic instability) refers to a high frequency of mutations within the genome of a cellular lineage.
A germicidal lamp is a special type of lamp which produces ultraviolet (UVC) light.
In thermodynamics, heat is energy transferred from one system to another as a result of thermal interactions.
A helmet is a form of protective gear worn to protect the head from injuries.
A heterotroph (Ancient Greek ἕτερος héteros.
Hinduism is an Indian religion and dharma, or a way of life, widely practised in the Indian subcontinent.
Homologous recombination is a type of genetic recombination in which nucleotide sequences are exchanged between two similar or identical molecules of DNA.
The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not.
The human eye is an organ which reacts to light and pressure.
Human skin color ranges in variety from the darkest brown to the lightest hues.
An ice age is a period of long-term reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers.
In photometry, illuminance is the total luminous flux incident on a surface, per unit area.
Immunosuppression is a reduction of the activation or efficacy of the immune system.
Indoor tanning involves using a device that emits ultraviolet radiation to produce a cosmetic tan.
Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.
The inverse-square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity.
In radiometry, irradiance is the radiant flux (power) received by a surface per unit area.
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
In astronomy, Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.
Leisure has often been defined as a quality of experience or as free time. Free time is time spent away from business, work, job hunting, domestic chores, and education, as well as necessary activities such as eating and sleeping.
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
Light therapy—or phototherapy, classically referred to as heliotherapy—consists of exposure to daylight or to specific wavelengths of light using polychromatic polarised light, lasers, light-emitting diodes, fluorescent lamps, dichroic lamps or very bright, full-spectrum light.
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics.
Lighting or illumination is the deliberate use of light to achieve a practical or aesthetic effect.
Limb darkening is an optical effect seen in stars (including the Sun), where the center part of the disk appears brighter than the edge or limb of the image.
The following is a list of cities by sunshine duration.
The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source.
Luminous efficacy is a measure of how well a light source produces visible light.
The lux (symbol: lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area.
Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field.
A Malthusian catastrophe (also known as Malthusian check or Malthusian spectre) is a prediction of a forced return to subsistence-level conditions once population growth has outpaced agricultural production - that there will be too many people and not enough food.
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.
Mechanistic organic photochemistry is that aspect of organic photochemistry which seeks to explain the mechanisms of organic photochemical reactions.
Melanocytes are melanin-producing neural crest-derived cells located in the bottom layer (the stratum basale) of the skin's epidermis, the middle layer of the eye (the uvea), the inner ear, vaginal epithelium, meninges, bones, and heart.
Melatonin, also known as N-acetyl-5-methoxy tryptamine, is a hormone that is produced by the pineal gland in animals and regulates sleep and wakefulness.
Mercury is the smallest and innermost planet in the Solar System.
Milankovitch cycles describe the collective effects of changes in the Earth's movements on its climate over thousands of years.
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.
Moonlight consists of mostly sunlight (with little earthlight) reflected from the parts of the Moon's surface where the Sun's light strikes.
In genetics, a mutagen is a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level.
The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (m).
The United States National Geophysical Data Center (NGDC) provided scientific stewardship, products and services for geophysical data describing the solid earth, marine, and solar-terrestrial environment, as well as earth observations from space.
Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
Naturism, or nudism, is a cultural and political movement practising, advocating, and defending personal and social nudity, most but not all of which takes place on private property.
The Neolithic Revolution, Neolithic Demographic Transition, Agricultural Revolution, or First Agricultural Revolution, was the wide-scale transition of many human cultures during the Neolithic period from a lifestyle of hunting and gathering to one of agriculture and settlement, making an increasingly larger population possible.
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
A neutrino (denoted by the Greek letter ν) is a fermion (an elementary particle with half-integer spin) that interacts only via the weak subatomic force and gravity.
New Urbanism is an urban design movement which promotes environmentally friendly habits by creating walkable neighborhoods containing a wide range of housing and job types.
Nicotiana tabacum, or cultivated tobacco, is an annually-grown herbaceous plant.
In nuclear physics, nuclear fusion is a reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles (neutrons or protons).
Nudity, or nakedness, is the state of wearing no clothing.
A nutrient is a substance used by an organism to survive, grow, and reproduce.
An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings.
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
In biology, an organism (from Greek: ὀργανισμός, organismos) is any individual entity that exhibits the properties of life.
Over illumination is the presence of lighting intensity higher than that which is appropriate for a specific activity.
The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation.
Painting is the practice of applying paint, pigment, color or other medium to a solid surface (support base).
The Paris Observatory (Observatoire de Paris or Observatoire de Paris-Meudon), a research institution of PSL Research University, is the foremost astronomical observatory of France, and one of the largest astronomical centres in the world.
A park is an area of natural, semi-natural or planted space set aside for human enjoyment and recreation or for the protection of wildlife or natural habitats.
Peak oil is the theorized point in time when the maximum rate of extraction of petroleum is reached, after which it is expected to enter terminal decline.
The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.
Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth's surface.
Photic retinopathy, also known as foveomacular retinitis or solar retinopathy, is damage to the eye's retina, particularly the macula, from prolonged exposure to solar radiation or other bright light, e.g., lasers or arc welders.
The photic sneeze reflex (also known as, Autosomal Compelling Helio-Ophthalmic Outburst (ACHOO) and colloquially sun sneezing) is a condition that causes sneezing in response to numerous stimuli, such as looking at bright lights or periocular (surrounding the eyeball) injection.
Photoaging or photoageing (also known as "dermatoheliosis") is a term used for the characteristic changes to skin induced by chronic UVA and UVB exposure.
Photography is the science, art, application and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.
Photokeratitis or ultraviolet keratitis is a painful eye condition caused by exposure of insufficiently protected eyes to the ultraviolet (UV) rays from either natural (e.g. intense sunlight) or artificial (e.g. the electric arc during welding) sources.
The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities (energy transformation).
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.
Poaceae or Gramineae is a large and nearly ubiquitous family of monocotyledonous flowering plants known as grasses, commonly referred to collectively as grass.
Human prehistory is the period between the use of the first stone tools 3.3 million years ago by hominins and the invention of writing systems.
Primary energy (PE) is an energy form found in nature that has not been subjected to any human engineered conversion process.
Psoriasis is a long-lasting autoimmune disease characterized by patches of abnormal skin.
PUVA (psoralen and ultraviolet A) is an ultraviolet light therapy treatment for eczema, psoriasis, graft-versus-host disease, vitiligo, mycosis fungoides, large-plaque parapsoriasis and cutaneous T-cell lymphoma using the sensitizing effects of the drug psoralen.
A pyranometer is a type of actinometer used for measuring solar irradiance on a planar surface and it is designed to measure the solar radiation flux density (W/m2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.
A pyrheliometer is an instrument for measurement of direct beam solar irradiance.
In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area.
In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation.
In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted or received, per unit time, and spectral flux or spectral power is the radiant flux per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has an unpaired valence electron.
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
Rayleigh scattering (pronounced), named after the British physicist Lord Rayleigh (John William Strutt), is the (dominantly) elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation.
Reactive oxygen species (ROS) are chemically reactive chemical species containing oxygen.
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
A season is a division of the year marked by changes in weather, ecology, and amount of daylight.
Seasonal affective disorder (SAD) is a mood disorder subset in which people who have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year, most commonly in the winter.
In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the widest points of the perimeter.
Shade is the blocking of sunlight (in particular direct sunshine) by any object, and also the shadow created by that object.
A shade tree is any tree grown specifically for its shade.
A sidewalk cafe (sometimes called a pavement cafe, cafe terrace, or patio) is an outdoor part of a coffeehouse or cafe.
Skin cancers are cancers that arise from the skin.
The Solar and Heliospheric Observatory (SOHO) is a spacecraft built by a European industrial consortium led by Matra Marconi Space (now Astrium) that was launched on a Lockheed Martin Atlas II AS launch vehicle on December 2, 1995, to study the Sun, and has discovered over 3000 comets.
The solar cycle or solar magnetic activity cycle is the nearly periodic 11-year change in the Sun's activity (including changes in the levels of solar radiation and ejection of solar material) and appearance (changes in the number and size of sunspots, flares, and other manifestations).
A solar flare is a sudden flash of increased Sun's brightness, usually observed near its surface.
Solar irradiance is the power per unit area received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument.
The Solar Radiation and Climate Experiment (SORCE) is a NASA-sponsored satellite mission that measures incoming X-ray, ultraviolet, visible, near-infrared, and total solar radiation.
The Solar SystemCapitalization of the name varies.
The South Pole, also known as the Geographic South Pole or Terrestrial South Pole, is one of the two points where the Earth's axis of rotation intersects its surface.
The power spectrum S_(f) of a time series x(t) describes the distribution of power into frequency components composing that signal.
The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2 (Unicode character). It is the area of a square whose sides measure exactly one metre.
A standard illuminant is a theoretical source of visible light with a profile (its spectral power distribution) which is published.
Starlight is the light emitted by stars.
The Sun is the star at the center of the Solar System.
Sun tanning or simply tanning is the process whereby skin color is darkened or tanned.
Sunburn is a form of radiation burn that affects living tissue, such as skin, that results from an overexposure to ultraviolet (UV) radiation, commonly from the sun.
Sunglasses or sun glasses (informally called shades) are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes.
Sunshine duration or sunshine hours is a climatological indicator, measuring duration of sunshine in given period (usually, a day or a year) for a given location on Earth, typically expressed as an averaged value over several years.
"Sunshine recorder" redirects here.
A swimming pool, swimming bath, wading pool, or paddling pool is a structure designed to hold water to enable swimming or other leisure activities.
Thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter.
Thomas Carl Hartmann (born May 7, 1951) is an American radio host, author, former psychotherapist, businessman, and progressive political commentator.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions.
An umbrella or parasol is a folding canopy supported by wooden or metal ribs, which is usually mounted on a wooden, metal, or plastic pole.
Uranus is the seventh planet from the Sun.
A vacation or holiday is a leave of absence from a regular occupation, or a specific trip or journey, usually for the purpose of recreation or tourism.
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
A visor (also spelled vizor) is a surface that protects the eyes, such as shading them from the sun or other bright light or protecting them from objects.
Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects.
A wall is a structure that defines an area, carries a load, or provides shelter or security.
The watt (symbol: W) is a unit of power.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
A window blind is a type of window covering.
A window shutter is a solid and stable window covering usually consisting of a frame of vertical stiles and horizontal rails (top, centre and bottom).
The World Meteorological Organization (WMO) is an intergovernmental organization with a membership of 191 Member States and Territories.
X-rays make up X-radiation, a form of electromagnetic radiation.
The zenith is an imaginary point directly "above" a particular location, on the imaginary celestial sphere.
90377 Sedna is a large minor planet in the outer reaches of the Solar System that was,, at a distance of about 86 astronomical units (AU) from the Sun, about three times as far as Neptune.
Natural lighting, Solar Irradiation, Solar output, Solar spectrum, Sun emission spectrum, Sun light, Sun radiation, Sun shine, Sun's radiation, Sun's ray, Sunlit, Sunniness, Sunshine, Total Solar Irradiance, Uses of sunlight.