Answer:

Northern Hemisphere dwellers, or most of the Earth's population, have probably all noticed longer days and shorter nights in the summer and the opposite in winter. The phenomenon occurs because the Earth's axis is not straight up and down at a 90 degree angle, byt it is instead tilted a bit.

The Earth's rotation causes darkness and day to alternate. Since we discovered that the Earth's axis is tilted and, as a result, the equator does not always face the sun directly, various parts of the globe would experience varying lengths of days and nights--not always exactly 12 hours of day and 12 hours of night.

Explanation:

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