February 29, also known as leap year day, is a date added to most years that are divisible by 4, such as 2016, 2020, and 2024. A leap day is observed because the Earth's period of orbital revolution around the Sun takes approximately 6 hours longer than 365 whole days. A leap day compensates for this lag, realigning the calendar with the Earth's position in the Solar System; otherwise, seasons would occur later than intended in the calendar year. #DiscoverGlobe 🌏 | Science Channel