A day is the period it takes an object to rotate once on it's axis.
The moon has an axis, and as the moon orbits the Earth, it keeps the same face toward the earth. So the moon rotates on its axis the same length of time it takes to rotate the earth -28 days.
Neptune's rotation period takes 16hours and 17minutes to rotate on its axis.
It takes 58 days for mercury to rotate on its axis.
its rotation takes about 243 Earth days to rotate on its axis
10.656 hours is how long it takes Saturn to rotate one time on its axis. That is the length of time for a 'day' on Saurn.
Eris takes approximately 550 Earth years to rotate on its axis.
It takes about 58.6 Earth days to rotate:)
The earth to rotate about its axis.
It takes roughly 6.4 Earth days for Neptune to rotate on it's axis.
59 days
Venus