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In page Gravitational constant:
"Calculations in celestial mechanics can also be carried out using the units of solar masses, mean solar days and astronomical units rather than standard SI units. For this purpose, the Gaussian gravitational constant was historically in widespread use, k = 0.01720209895 radians per day, expressing the mean angular velocity of the Sun–Earth system.[citation needed] The use of this constant, and the implied definition of the astronomical unit discussed above, has been deprecated by the IAU since 2012.[citation needed]
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