11 relations: Apparent magnitude, Auriga (constellation), Binary star, Epoch (astronomy), Gamma Doradus variable, Hipparcos, Red dwarf, Sky & Telescope, Star, Stellar parallax, Variable star designation.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Auriga is one of the 88 modern constellations; it was among the 48 constellations listed by the 2nd-century astronomer Ptolemy.
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.
Gamma Doradus variables are variable stars which display variations in luminosity due to non-radial pulsations of their surface.
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.
A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.
Sky & Telescope (S&T) is a monthly American magazine covering all aspects of amateur astronomy, including the following.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.
Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.
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.