Astronomy and Astrophysics - GNU Scientific Library -- Reference Manual
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### 40.2 Astronomy and Astrophysics

`GSL_CONST_MKSA_ASTRONOMICAL_UNIT`
  The length of 1 astronomical unit (mean earth-sun distance), au.
`GSL_CONST_MKSA_GRAVITATIONAL_CONSTANT`
  The gravitational constant, G.
`GSL_CONST_MKSA_LIGHT_YEAR`
  The distance of 1 light-year, ly.
`GSL_CONST_MKSA_PARSEC`
  The distance of 1 parsec, pc.
`GSL_CONST_MKSA_GRAV_ACCEL`
  The standard gravitational acceleration on Earth, g.
`GSL_CONST_MKSA_SOLAR_MASS`
  The mass of the Sun.

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