Question

3.) how do we measure the length of a day? a. how long it takes the moon to orbit earth b. how long it takes the earth to spin around one time c. how long it takes the earth to orbit the sun

Explanation:

A day is measured by the time it takes for the Earth to spin around its axis. The Earth's rotation on its axis gives us the length of a day. The moon's orbit around Earth takes about a month, and the Earth's orbit around the Sun takes about a year.

Answer:

B. how long it takes the Earth to spin around