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 Quote by Sherv Hello, Thank you for your posts, unfortunately the debate still rages and qualifications are now being questioned. Is anyone who has already commented a qualified physicist / mathematician / Scientist etc .. ? lol sorry to hassle !!
You can find the orbital velocity of the Earth (taking the Earth's mass into account) by the formula:

$$V_o = \sqrt{\frac{M_s^2 G}{(M_s+M_e)r}}$$

Ms and Me are the masses of the Sun and Earth respectively, G is the Gravitational constant and r the distance between the Earth and Sun.

Using 2e30kg for Ms, 6e24 kg for Me and 1.5e11 m for r, this gives us an answer of

29828.35336 m/s

Doubling "Me" gives an answer of

29828.30862