- #1

physiks

- 101

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a

^{3}/P

^{2}=G(M1+M2)/4π

^{2}.

Where a=a1+a2.

The problem is that I have been told that when using the units of years, solar masses and astronomical units, this reduces to

a

^{3}/P

^{2}=M1+M2.

I'm not sure how to show this is true, and find it quite strange that such a unit change could manage to perfectly cancel out G/4π

^{2}. The internet and textbooks don't seem to be very helpful about this so I was hoping somebody could point me in the right way, thanks!