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A light-year (or light year, abbreviation: ly[3]) is a unit of length used informally to express astronomical distances. It is approximately 9 trillion kilometres (or about 6 trillion miles).[note 1] As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).[2]
Hence, the number 384,403 km, is an average distance that astronomers call the semi-major axis. At its closest point (known as perigee) the Moon is only 363,104 km (225,622 miles) away. And at its most distant point (called apogee) the Moon gets to a distance of 406,696 km (252,088 miles). This means that distance from the Earth to the Moon can vary by 43,592 km. Thatâs a pretty big difference, and it can make the Moon appear dramatically different in size depending on where it is in its orbit.