# earth

if the radius of the earth's orbit around the sun is 93,000,000 miles, what is the speed of the earth in it's orbit in miles per hour?

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1. One year = 365.25 days = 8766 hours

The circumference of the orbit is 93,000,000(2)3.14 = 584,336,234 miles

The orbital velocity is therefore
V = 584,336,234/8766 = 66,660 mph.

It could also be derived knowing the Sun's gravitational constant GM = 4.68772x10^21 ft.^3/sec.^2.

The velocity required to keep the earth in a circular orbit derives from
Vc = sqrt(GM/r), r in feet.

Therefore, Vc = sqrt[(4.687872x10^21(93,000,000)5280] = 97,706 fps = 66,618 mph.

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