How many days does it take to revolve once around the earth?

Answer 1

That completely depends on the size of your orbit.

-- If you're in "low Earth orbit", a few hundred miles above the surface, like the

Hubble Space Telescope, the International Space Station, or an astronaut 'floating'

around one of them, then the period of the orbit is around 90 minutes.

-- If you're in a 22,000-mile orbit, like a geosynchronous satellite, then the period

of the orbit is 24 hours.

-- If you're in a 238,000-mile orbit, like the moon, then the period of the orbit is 27.3 days.