astronomical year

An astronomical year, also called a tropical year, is the time it takes for the Sun to return to the same position relative to Earth's cycle of seasons, such as from one spring equinox to the next. It is approximately 365.2425 days long. This measurement helps in understanding our calendar system and aligning it with the Earth's orbit. Because of that fractional day, calendar years sometimes need adjustment, like leap years, to stay synchronized with the Earth's position relative to the Sun, ensuring that seasons occur at consistent times each year.