30 relations: Apparent magnitude, Bayer designation, Binary star, Epoch (astronomy), Eridanus (constellation), Flamsteed designation, Former constellations, Gottfried Kirch, Hipparcos, IAU Working Group on Star Names, International Astronomical Union, Johann Elert Bode, Latin, Light-year, Margraviate of Brandenburg, Orbit, Orbital eccentricity, Orbital period, Parsec, Prussia, Red giant, Sceptrum Brandenburgicum, Sky & Telescope, Solar mass, Solar radius, Star system, Stellar classification, Stellar evolution, Stellar parallax, Sun.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
A binary star is a star system consisting of two stars orbiting around their common barycenter.
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 astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
Eridanus is a constellation in the southern hemisphere.
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
Former constellations are old historical Western constellations that for various reasons are no longer recognized or adopted as official constellations by the International Astronomical Union (IAU).
Gottfried Kirch (Kirche, Kirkius) (December 18, 1639 – July 25, 1710) was a German astronomer and the first 'Astronomer Royal' in Berlin and, as such, director of the nascent Berlin Observatory.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
The International Astronomical Union (IAU) established a Working Group on Star Names (WGSN) in May 2016 to catalog and standardize proper names for stars for the international astronomical community.
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
Johann Elert Bode (19 January 1747 – 23 November 1826) was a German astronomer known for his reformulation and popularisation of the Titius–Bode law.
Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
The Margraviate of Brandenburg (Markgrafschaft Brandenburg) was a major principality of the Holy Roman Empire from 1157 to 1806 that played a pivotal role in the history of Germany and Central Europe.
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.
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.
The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
Prussia (Preußen) was a historically prominent German state that originated in 1525 with a duchy centred on the region of Prussia.
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
Sceptrum Brandenburgicum (or Sceptrum Brandenburgium – Latin for scepter of Brandenburg) was a constellation created in 1688 by Gottfried Kirch, astronomer of the Prussian Royal Society of Sciences.
Sky & Telescope (S&T) is a monthly American magazine covering all aspects of amateur astronomy, including the following.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
Solar radius is a unit of distance used to express the size of stars in astronomy.
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Stellar evolution is the process by which a star changes over the course of time.
Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.
The Sun is the star at the center of the Solar System.
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.