Physics – 6.1.1 The Earth | e-Consult

The Earth's axis of rotation is tilted at an angle of approximately 23.5 degrees relative to the plane of its orbit around the Sun. This tilt is the primary reason for the cycle of day and night and the variation in day length throughout the year.

As the Earth rotates, different hemispheres are angled towards the Sun. When a hemisphere is tilted towards the Sun, it experiences summer, with longer periods of daylight. The Sun's rays hit this hemisphere more directly, increasing the intensity of sunlight. Conversely, the opposite hemisphere experiences winter, with shorter periods of daylight and less direct sunlight.

When a hemisphere is tilted away from the Sun, it experiences winter. The Sun's rays are less direct, resulting in shorter days and colder temperatures. The other hemisphere experiences summer.

The cycle of day and night is directly related to the Earth's rotation and the tilt of its axis. The tilt causes the Sun's rays to be distributed unevenly across the Earth's surface throughout the year, leading to seasonal variations in day length and temperature.