The astronomical unit of time is the day (D), defined as 86400 seconds.
365.25 days make up one Julian year (yr).
The astronomical unit of mass is the solar mass (M⊙) = 1.98892×1030 kg.
We will also use kg. For example, the mass of the Earth is 1 M⊕ = 5.9742 × 1024 kg
The astronomical unit (A.U.) the mean Earth-Sun distance.
1 A.U. = 1.495 978 707 00 × 1011 meters or roughly 149 million km.
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