Explain the length of days and nights

The length of days and nights changes throughout the year due to the tilt of the Earth's axis. The Earth is tilted at an angle of approximately 23.5 degrees relative to its orbital plane around the Sun. As the Earth orbits the Sun, this tilt causes different parts of the planet to receive more direct sunlight at different times of the year. When a hemisphere is tilted towards the Sun, it experiences summer, with longer days and shorter nights because it receives sunlight for a greater portion of its rotation. Conversely, when a hemisphere is tilted away from the Sun, it experiences winter, with shorter days and longer nights. The equinoxes (around March 20 and September 22) are when neither hemisphere is tilted towards or away from the Sun, resulting in roughly equal lengths of day and night all over the world.