Question

Why do days and nights become longer and shorter ?

Answer 1

Answer:

This is because the Earth's imaginary axis isn't straight up and down, it is tilted 23.5 degrees. As the Earth moves around the sun during a year, the northern half of the Earth is tilted towards the sun in the summer, making daytime longer than night.

Answer 2

Days and nights become longer and shorter due to the inclination of the earth's axis.

Explanation:

• The movement of the earth around its axis is called rotation.
• The axis of the earth is an imaginary line that joins the North and South Poles. It is not vertical but tilted at one side at an angle of $23\frac{1}{2} \°$ from the Vertical line. It means that the earth's axis makes an angle of $66\frac{1}{2} \°$ to the orbital plane.
• The earth spins on the orbital plane around the sun. This axis tilting is called the inclination of the earth's axis.
• The earth completes one spin on its axis in 24 hours. When the earth spins on its axis, one-half of the earth's surface faces the sun, and the other half remains away from the sun. So, the face that faces the sun has day and away from the sun has night.

Length of Days and Nights:

• The areas far from the equator have more hours of daylight than those near the equator on winter days.
• The two poles - the North Pole and the South Pole receive darkness continuously for six months, followed by daylight continuously for six months.

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