👉 In astronomy, a perihelion is the point in the night sky where the Moon passes directly between Earth and the Sun. It occurs when the Moon is at its closest distance from the Earth to the point of maximum visibility. The perihelion position can be calculated using the sidereal year (365.24 days), which is the length of one orbit around the Earth, or by using a specific date and time on the calendar that corresponds with the solstices and