A circle surrounding the earth at the equator would consist of “degrees” of angular measurement. 90

360°

Explanation:

Earth rotation can be defined as the amount of time taken by planet earth to complete its spinning movement on its axis.

This ultimately implies that, the rotation of earth refers to the time taken by earth to rotate once on its axis. One spinning movement of the earth on its axis takes approximately 24 hours to complete with respect to the Sun. Therefore, in a 24 hour period, the earth rotates 360 degrees about its axis and as such in an hour it rotates 15 degrees to create a 24-hours time zones.

When the earth's equatorial plane intersect with the surface of a celestial sphere, it results in the formation of a great circle which divides or cuts the earth into two equal halves known as celestial equator. This great circle divides the earth into a circumference having two (2) equal halves.

Hence, a circle surrounding the earth at the equator would consist of 360 “degrees” of angular measurement. Thus, giving rise to latitude (zones of latitude) which is north or south of the equator that includes equatorial, low latitude, mid latitude, tropical, subtropical and polar regions.

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