42 relations: Apparent magnitude, Argentina, Astrometry, Astronomische Gesellschaft Katalog, Astronomy, Astrophysics, Berlin, Bonn, Cape Town, Carte du Ciel, Catalogues of Fundamental Stars, Córdoba, Argentina, Celestial cartography, Celestial coordinate system, Celestial mechanics, Double star, Durchmusterung, Earth's rotation, Ecliptic, Electromagnetic spectrum, Equinox, Equinox (celestial coordinates), Gaia (spacecraft), Geodesy, Geodetic astronomy, Germany, Hipparcos, Observatory, Photography, Radio astronomy, Reference, Scientific community, Sirius, Smithsonian Astrophysical Observatory Star Catalog, Solar System, South Africa, Southern Hemisphere, Star, Star catalogue, Tycho-2 Catalogue, Visible spectrum, Visual system.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Argentina, officially the Argentine Republic (República Argentina), is a federal republic located mostly in the southern half of South America.
Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.
The Astronomische Gesellschaft Katalog (AGK) is an astrometric star catalogue.
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
Astrophysics is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of the astronomical objects, rather than their positions or motions in space".
Berlin is the capital and the largest city of Germany, as well as one of its 16 constituent states.
The Federal City of Bonn is a city on the banks of the Rhine in the German state of North Rhine-Westphalia, with a population of over 300,000.
Cape Town (Kaapstad,; Xhosa: iKapa) is a coastal city in South Africa.
The Carte du Ciel (literally, 'Map of the Sky') and the Astrographic Catalogue (or Astrographic Chart) were two distinct but connected components of a massive international astronomical project, initiated in the late 19th century, to catalogue and map the positions of millions of stars as faint as 11th or 12th magnitude.
The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.
Córdoba is a city in the geographical center of Argentina, in the foothills of the Sierras Chicas on the Suquía River, about northwest of the Buenos Aires.
Celestial cartography, uranography, astrography or star cartography is the fringe of astronomy and branch of cartography concerned with mapping stars, galaxies, and other astronomical objects on the celestial sphere.
In astronomy, a celestial coordinate system is a system for specifying positions of celestial objects: satellites, planets, stars, galaxies, and so on.
Celestial mechanics is the branch of astronomy that deals with the motions of celestial objects.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Christmas traditions vary from country to country.
In observational astronomy, a double star or visual double is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope.
In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
Earth's rotation is the rotation of Planet Earth around its own axis.
The ecliptic is the circular path on the celestial sphere that the Sun follows over the course of a year; it is the basis of the ecliptic coordinate system.
The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
An equinox is commonly regarded as the moment the plane (extended indefinitely in all directions) of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 22-23 September.
In astronomy, equinox is a moment when the vernal point, celestial equator, and other such elements are taken to be used in the definition of a celestial coordinate system.
Gaia is a space observatory of the European Space Agency (ESA) designed for astrometry: measuring the positions and distances of stars with unprecedented precision.
Geodesy, also known as geodetics, is the earth science of accurately measuring and understanding three of Earth's fundamental properties: its geometric shape, orientation in space, and gravitational field.
Geodetic astronomy or astro-geodesy is the application of astronomical methods into networks and technical projects of geodesy.
Germany (Deutschland), officially the Federal Republic of Germany (Bundesrepublik Deutschland), is a sovereign state in central-western Europe.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.
In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.
An observatory is a location used for observing terrestrial or celestial events.
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.
Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies.
Reference is a relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object.
The scientific community is a diverse network of interacting scientists.
Sirius (a romanization of Greek Σείριος, Seirios,."glowing" or "scorching") is a star system and the brightest star in the Earth's night sky.
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
The Solar SystemCapitalization of the name varies.
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa.
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.
A star catalogue (Commonwealth English) or star catalog (American English), is an astronomical catalogue that lists stars.
The Tycho-2 Catalogue is an astronomical catalogue of more than 2.5 million of the brightest stars.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
The visual system is the part of the central nervous system which gives organisms the ability to process visual detail, as well as enabling the formation of several non-image photo response functions.
2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.
2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.
BD catalogue, Bonner Durchmusterung, Cape Durchmusterung, Cape Photographic Durchmusterung, Cape photographic Durchmusterung, Cape photographic durchmusterung, Cordoba Durchmusterung, Cordoba durchmusterung, Córdoba Durchmusterung.