An Equinox occurs twice a year when day and night are approximately equal in length. This happens because the Earth's tilt is such that the sun is directly above the equator. The two main equinoxes are the vernal equinox in March, marking the start of spring in the Northern Hemisphere, and the autumnal equinox in September, signaling the beginning of fall. During an equinox, many cultures celebrate various festivals and traditions. For example, the Spring Equinox is often associated with renewal and rebirth, while the Autumn Equinox is linked to harvest and gratitude. These events highlight the changing seasons and the balance of light and darkness.