[geocentrism] Re: The Sun/ Comment & question
- From: Alan Griffin <ajg@xxxxxxxxxxxxx>
- To: geocentrism@xxxxxxxxxxxxx
- Date: Sun, 08 Aug 2004 20:26:03 +0100
On 07 Aug, Philip <joyphil@xxxxxxxxxxx> wrote:
> Thanks for that Alan. Another similar question. How do they calculate
> the mass of the sun with any degree of accuracy. And the earth for that
> matter, as the composition of the interior is only presumed, as indeed
> all the heavenly bodies.
The mass of a body is easily calculated by timing a satellite
going round it, and knowing its distance.
The mass of the sun in Kg = (Radius of orbit in metres)cubed x
(angular velocity of earth in radians/sec)squared/Gravitational constant G)
= (1.5x10^11)^3 x (2xpi/(364.25 x 24 x 3600))^2 / 6.67x10^-11
which gives 2 x 10^30 kg or 2 x 10^27 tonnes!
You can use the same expression to weigh the earth, knowing the
distance of the moon and the time it takes to orbit.
Alan Griffin
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