The basis for defining the length of a day is the fact that
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 Earth to rotate once on its axis, which is approximately 24 hours. This means that Earth rotates 360 degrees in 24 hours, or 15 degrees of longitude per hour. This is the basis for defining the length of a day, as each location on Earth experiences a full rotation of 360 degrees every 24 hours.

The Basis for Defining the Length of a Day Is