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

The astronomical unit (symbol: au or AU) is a unit of length defined to be exactly equal to 149,597,870,700 m. Historically, the astronomical unit was...

orientation and rotation of the Earth, in its technical notes. The IAU system of constants defines a system of astronomical units for length, mass and time...

The atomic units are a system of natural units of measurement that is especially convenient for calculations in atomic physics and related scientific fields...

centimetre–gram–second system of units (CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and...

natural unit systems are measurement systems for which selected physical constants have been set to 1 through nondimensionalization of physical units. For...

metric system is sub-divided into SI and non-SI units. The base unit in the International System of Units (SI) is the meter, defined as "the length of the...

measure of the mass of a planet-like astronomical object. Within the Solar System, planets are usually measured in the astronomical system of units, where...

named after its choice of fundamental plane. The following table lists the common coordinate systems in use by the astronomical community. The fundamental...

absolute distances involved are much bigger.[citation needed] Astronomical system of units Planetary mass "Astrodynamic Constants". NASA/JPL. 27 February...

multiplicative unit prefixes. Though the rules governing the metric system have changed over time, the modern definition, the International System of Units (SI)...

predecessor's systems in their histories. In the present day, the People's Republic of China maintains some customary units based upon the market units but standardized...

An astronomical system positing that the Earth, Moon, Sun, and planets revolve around an unseen "Central Fire" was developed in the fifth century BC and...

physics and physical cosmology, Planck units are a system of units of measurement defined exclusively in terms of four universal physical constants: c,...

k expressed in the astronomical units (i.e. k2 has units A3S−1D−2), takes the value of 0.017 202 098 95 . This astronomical unit is approximately the...

light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles). The parsec unit is obtained by the use of parallax and trigonometry...

Wikiquote has quotations related to Distance. Absolute difference Astronomical system of units Color difference Closeness (mathematics) Distance geometry problem...

TAU (Thousand Astronomical Units) was a proposed uncrewed interstellar probe that would go to a distance of one thousand astronomical units (1000 AU) from...

in the astronomical system of units. The Sun is losing mass because of fusion reactions occurring within its core, leading to the emission of electromagnetic...

question marks, boxes, or other symbols. Astronomical symbols are abstract pictorial symbols used to represent astronomical objects, theoretical constructs and...

when expressed in the unit Hz, which is equal to s−1." Historically, many units of time were defined by the movements of astronomical objects. Sun-based:...

interest) are shown and expressed in terms of the corresponding SI unit. Conversions between units in the metric system are defined by their prefixes (for example...

within a star system tend to be small fractions of a light-year, and are usually expressed in astronomical units. However, smaller units of length can similarly...

distances make up an astronomical unit. The siriometer is an obsolete astronomical measure equal to one million astronomical units, i.e., one million times...

also necessary. Different distance units are used for different objects. Within the Solar System, astronomical units are used, and for objects near Earth...

coordinate, R (= √X2 + Y2 + Z2), in units of the astronomical unit. The positions of the planets and other Solar System bodies are often specified in the...

geocentric Δ). Different distance units are used for different objects. Within the Solar System, astronomical units are used, and for objects near the...

The AB magnitude system is an astronomical magnitude system. Unlike many other magnitude systems, it is based on flux measurements that are calibrated...

000 astronomical units (0.16 ly) from Sun. Raymond Arthur Lyttleton's model on the formation of the Solar System had a former binary star system by the...

2024-01-04. Hollis, Morgan (13 October 2016). "A universe of two trillion galaxies". The Royal Astronomical Society. Retrieved 9 November 2017. Jonathan Amos...