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here is an exact one based on numbers from Google
V = Sqrt(2GM/R)
Where G is the gravitational constant - 0.00000000006673
M is the mass of the sun - 1.98892 × 10^30 kg
Radius of the sun - 695 500 000 metres
zingle dingle give the calculator a whirl and you get
1 381 940.25 mph
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