What is the basis for defining the length of a day?
A)Earth rotates east to west.
B)Earth moves through 365.25 days a year in its orbit about the Sun.
C)Earth rotates on its axis in 24 hours; i.e.,it rotates 15° of longitude per hour.
D)Earth does not rotate; rather,it revolves.

Question

Quizplus · Accepted Answer

The length of a day is defined by the time it takes for the Earth to complete one full rotation on its axis. This rotation takes approximately 24 hours, and the Earth rotates at a speed of 15 degrees of longitude per hour. Therefore, the basis for defining the length of a day is that the Earth rotates on its axis in 24 hours, or 15 degrees of longitude per hour.

What Is the Basis for Defining the Length of a Day