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 149597870700 m. Historically, the astronomical unit was conceived...

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...

interest". Anthropic units Astronomical system of units Dimensionless physical constant International System of Units N-body units Outline of metrology and measurement...

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

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...

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...

System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and...

are the metric units, used in every country globally. In the United States the U.S. customary units are also in use. British Imperial units are still used...

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...

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...

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...

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

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...

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...

all of the other planets in the Solar System combined. Jupiter mass is a common unit of mass in astronomy that is used to indicate the masses of other...

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

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...

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

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...

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

fixed points, perched on the horizon. Azimuth Astronomical coordinate systems Astronomical coordinate systems § Converting coordinates Geocentric coordinates...

The Solar System is constantly flooded by the Sun's charged particles, the solar wind, forming the heliosphere. Around 75–90 astronomical units from the...

not have an integer number of days or lunar months. Any calendar that follows an astronomical year must have a system of intercalation such as leap years...

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

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:...

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

An astronomical interferometer or telescope array is a set of separate telescopes, mirror segments, or radio telescope antennas that work together as a...