domain/astronomical library
Quantity types, units and constants commonly encountered in the field of Astronomy and related sciences.
Classes
 Acceleration
 The rate of change of speed of an object. See the Wikipedia entry for Acceleration for more information.
 AccelerationUnits
 Units acceptable for use in describing Acceleration quantities.
 EnergyFlux
 The rate of transfer of energy through a surface. See the Wikipedia entry for Energy density for more information.
 Frequency
 The number of occurrences of a repeating event per unit time. See the Wikipedia entry for Frequency for more information.
 Length
 Represents the length physical quantity (one of the seven base SI quantities). See the Wikipedia entry for Length for more information.
 LengthUnits
 Units acceptable for use in describing Length quantities.
 Mass
 Represents the mass physical quantity (one of the seven base SI quantities), that determines the strength of a body's mutual gravitational attraction to other bodies. See the Wikipedia entry for Mass for more information.
 Power
 Amount of energy per unit time. See the Wikipedia entry for Power (physics) for more information.
 SpectralIrradianceUnits
 Units acceptable for use in describing SpectralIrradiance quantities.
 TimeUnits
 Units acceptable for use in describing Time quantities.
Constants
 earthMass → const Mass
 Mass of the Earth.
 earthRadiusEquatorial → const Length
 The radius of the Earth at the equator.
 gravitySolarSurface → const Acceleration
 The gravitational acceleration experienced at the 'surface' of the Sun.
 hubbleConstant → const Frequency
 Used to describe the expansion of the universe.
 solarConstant → const EnergyFlux
 The mean solar electromagnetic radiation (the solar irradiance) per unit area that would be incident on a plane perpendicular to the rays, at a distance of one astronomical unit (AU) from the Sun.
 solarLuminosity → const Power
 The solar luminosity constant is the radiant flux (power emitted in the form of photons) emitted by the Sun (a typical value; the Sun's output actually varies slightly over time).
 solarMass → const Mass
 Mass of the Sun.
 solarRadius → const Length
 The radius of the Sun.
 wienDisplacement → const MiscQuantity
 Wien Displacement Law Constant ('b')
Properties
 astronomicalUnits → LengthUnits

The mean distance from the center of the earth to the center of the sun.
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 gees → AccelerationUnits

A unit based on the acceleration experienced by a freefalling body at the Earth's surface.
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 janskys → SpectralIrradianceUnits

A nonSI unit of spectral irradiance used especially in radio astronomy.
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 lightYears → LengthUnits

The distance light travels in one year.
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 microjanskys ↔ SpectralIrradianceUnits

One millionth of a Jansky.
getter/setter pair
 parsecs → LengthUnits

A nonstandard unit of length.
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 xUnits → LengthUnits

A nonstandard unit of length.
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 yearsJulian → TimeUnits

Defined as exactly 365.25 days of 86400 SI seconds each.
The length of the Julian year is the average length of the year in the Julian calendar that was used in Western
societies until some centuries ago, and from which the unit is named.
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 yearsSidereal → TimeUnits

Sidereal years as a unit.
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 yearsTropical → TimeUnits

Tropical years as a unit.
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