55 relations: Absolute value, Alpha Crucis, Altitude, Angular distance, Arctic Circle, Asterism (astronomy), Atmospheric refraction, Azimuth, Big Dipper, Canopus, Capella, Cassiopeia (constellation), Celestial equator, Celestial pole, Celestial sphere, Cepheus (constellation), Constellation, Contiguous United States, Cornwall, Crux, Declination, Deneb, Diurnal motion, Earth's rotation, Equator, Fresno, California, Horizon, Horizontal coordinate system, Hydrus, Isles of Scilly, Latitude, London, Louisville, Kentucky, Musca, North Pole, Northern celestial hemisphere, Northern Hemisphere, Patagonia, Pole star, San Francisco, South America, South Pole, Southern Hemisphere, Star, Sun, Tangent, Tropic of Cancer, Tropic of Capricorn, Tulsa, Oklahoma, Ursa Major, ..., Ursa Minor, Vanishing point, Vega, Virginia Beach, Virginia, Voyages of Christopher Columbus. Expand index (5 more) » « Shrink index
In mathematics, the absolute value or modulus of a real number is the non-negative value of without regard to its sign.
Alpha Crucis (α Crucis, abbreviated Alpha Cru, α Cru) is a multiple star system located 321 light-years from the Sun in the constellation of Crux and part of the asterism known as the Southern Cross.
Altitude or height (sometimes known as depth) is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, atmospheric pressure, and many more).
In mathematics (in particular geometry and trigonometry) and all natural sciences (e.g. astronomy and geophysics), the angular distance (angular separation, apparent distance, or apparent separation) between two point objects, as viewed from a location different from either of these objects, is the angle of length between the two directions originating from the observer and pointing toward these two objects.
The Arctic Circle is the most northerly of the five major circles of latitude as shown on maps of Earth.
In observational astronomy, an asterism is a popular known pattern or group of stars that are recognised in the night sky.
Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height.
An azimuth (from the pl. form of the Arabic noun "السَّمْت" as-samt, meaning "the direction") is an angular measurement in a spherical coordinate system.
The Big Dipper (US) or the Plough (UK) is an asterism consisting of seven bright stars of the constellation Ursa Major; six of them are of second magnitude and one, Megrez (δ), of third magnitude.
Canopus, also designated Alpha Carinae (α Carinae, abbreviated Alpha Car, α Car), is the brightest star in the southern constellation of Carina, and the second-brightest star in the night-time sky, after Sirius.
Capella, also designated Alpha Aurigae (α Aurigae, abbreviated Alpha Aur, α Aur), is the brightest star in the constellation of Auriga, the sixth-brightest in the night sky, and the third-brightest in the northern celestial hemisphere after Arcturus and Vega.
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty.
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
The north and south celestial poles are the two imaginary points in the sky where the Earth's axis of rotation, indefinitely extended, intersects the celestial sphere.
In astronomy and navigation, the celestial sphere is an abstract sphere with an arbitrarily large radius concentric to Earth.
Cepheus is a constellation in the northern sky, which is named after Cepheus (a King in the Greek mythology).
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
The contiguous United States or officially the conterminous United States consists of the 48 adjoining U.S. states plus Washington, D.C. on the continent of North America.
Cornwall (Kernow) is a county in South West England in the United Kingdom.
Crux is a constellation located in the southern sky in a bright portion of the Milky Way.
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
Deneb, also designated α Cygni (Latinised alpha Cygni, abbreviated Alpha Cyg, α Cyg), is the brightest star in the constellation of Cygnus.
Diurnal motion (lit, from dies, lit. "day") is an astronomical term referring to the apparent daily motion of stars around Earth, or more precisely around the two celestial poles.
Earth's rotation is the rotation of Planet Earth around its own axis.
An equator of a rotating spheroid (such as a planet) is its zeroth circle of latitude (parallel).
Fresno (Spanish for "ash tree") is a city in California, United States, and the county seat of Fresno County.
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 horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane.
Hydrus is a small constellation in the deep southern sky.
The Isles of Scilly (Syllan or Enesek Syllan) is an archipelago off the southwestern tip of Cornwall.
In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.
London is the capital and most populous city of England and the United Kingdom.
Louisville is the largest city in the Commonwealth of Kentucky and the 29th most-populous city in the United States.
Musca is a small constellation in the deep southern sky.
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is (subject to the caveats explained below) defined as the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.
The Northern Celestial Hemisphere, or the Northern Sky, is the northern half of the celestial sphere; that is, it lies north of the celestial equator.
The Northern Hemisphere is the half of Earth that is north of the Equator.
Patagonia is a sparsely populated region located at the southern end of South America, shared by Argentina and Chile.
Pole star or polar star refers to a star, preferably bright, closely aligned to the axis of rotation of an astronomical object.
San Francisco (initials SF;, Spanish for 'Saint Francis'), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California.
South America is a continent in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere.
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 Southern Hemisphere is the half of Earth that is south of the Equator.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
The Sun is the star at the center of the Solar System.
In geometry, the tangent line (or simply tangent) to a plane curve at a given point is the straight line that "just touches" the curve at that point.
The Tropic of Cancer, also referred to as the Northern Tropic, is the most northerly circle of latitude on Earth at which the Sun can be directly overhead.
The Tropic of Capricorn (or the Southern Tropic) is the circle of latitude that contains the subsolar point on the December (or southern) solstice.
Tulsa is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States.
Ursa Major (also known as the Great Bear) is a constellation in the northern sky, whose associated mythology likely dates back into prehistory.
Ursa Minor (Latin: "Lesser Bear", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the Northern Sky.
A vanishing point is a point on the image plane of a perspective drawing where the two-dimensional perspective projections (or drawings) of mutually parallel lines in three-dimensional space appear to converge.
Vega, also designated Alpha Lyrae (α Lyrae, abbreviated Alpha Lyr or α Lyr), is the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus.
Virginia Beach is an independent city located on the southeastern coast of the Commonwealth of Virginia in the United States.
In 1492, a Spanish-based transatlantic maritime expedition led by Christopher Columbus encountered the Americas, a continent which was largely unknown in Europe and outside the Old World political and economic system.