It takes the Earth one year to complete a full circle around the Sun, but do you know how long it takes the Earth to spin once on its own axis?

Ok, well, technically speaking it's 23 hours and 56 minutes, but let's just say 1 day. During this period of time, known as a sidereal day to astronomers, all the stars appear to revolve one time around the Earth and end back in their starting positions.

Asked by Rachel Bortles · Last updated 5 years ago · 1.5K views · SOURCE