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Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe. They are often...

average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition in 2012. The astronomical unit is used primarily...

determine the distances to celestial objects. A direct distance measurement of an astronomical object is possible only for those objects that are "close...

measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i...

The astronomical system of units, formerly called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy...

center of mass; this is used for astronomical distances such as the Earth–Moon distance. One may measure the distance between the closest points of the...

spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation:...

lunar distances make up an AU astronomical unit (roughly the distance from Earth to the Sun). Lunar distance is commonly used to express the distance to...

astronomical distance scale relies on a sequence of indirect and sometimes uncertain measurements relating the closest objects, for which distances can...

are Polaris B, a 1.39 M☉ F3 main-sequence star orbiting at a distance of 2,400 astronomical units (AU), and Polaris Ab (or P), a very close F6 main-sequence...

The Prague astronomical clock or Prague Orloj (Czech: Pražský orloj [praʃskiː orloj]) is a medieval astronomical clock attached to the Old Town Hall in...

distance of the astronomical objects listed below, the age of the universe since the Big Bang is currently estimated as 13.787±0.020 Gyr. Distances to...

measurement is similar to the idea behind the cosmic distance ladder for different ranges of astronomical length. Both calibrate different methods for length...

An astronomical object, celestial object, stellar object or heavenly body is a naturally occurring physical entity, association, or structure that exists...

an astronomical sextant (for measuring the distance between stars) or Stonehenge (which has some alignments on astronomical phenomena). Astronomical observatories...

tends to cancel itself out within large objects, so over large (astronomical) distances gravity tends to be the dominant force, and is responsible for...

Lemaître. In the mid 20th century, significant problems with the astronomical distance scale were resolved by dividing the Cepheids into different classes...

Publications of the Astronomical Society of the Pacific. 91: 642–647. Bibcode:1979PASP...91..642T. doi:10.1086/130556. Pan, X. (2004). "A distance of 133-137 parsecs...

This is a list of lists, grouped by type of astronomical object. List of Solar System objects List of gravitationally rounded objects of the Solar System...

Herbert Hall Turner in 1913 to simplify astronomers' calculations of astronomical distances from only raw observational data. Partly for this reason, it is...