As the sun starts to sink earlier and the nights get noticeably longer, you can tell that summer is coming to an end and the first day of fall is coming close! This year, the first day of fall, known as the autumnal equinox, is on September 22. There are only two equinoxes each year, vernal (spring) and autumnal (fall), with each one marking a day where day and night are about equal. This means that the Sun’s rays are hitting both sides of the Earth’s equator equally and the Earth’s axis (the invisible line around which Earth spins) is tilted directly straight at the Sun. For centuries, many...