The seasons change because of the tilt of Earth's axis relative to its orbit around the sun. This tilt causes different parts of the Earth to be exposed to different amounts of sunlight and heat, leading to the seasons of spring, summer, fall, and winter.

The calendar is a human-made system for organizing time, and it is related to the seasons because calendars often include a way of dividing the year into the four seasons. For example, in the Gregorian calendar, which is widely used today, the seasons are defined by the dates of the solstices and equinoxes, which are astronomical events that mark the longest and shortest days of the year and the two times of the year when the sun is directly overhead at the equator. These events are used as a reference point to define the start and end of the seasons, but the exact dates can vary depending on the specific calendar used.
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