Light-year Light-year The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. 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). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time. The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in nonspecialist and popular science publications. The unit most commonly used in professional astrometry is the parsec
Cape San Blas Light enclosing a stair cylinder, with the lantern above ground and above water. The 800,000 candela 3-foot 2-order electric light flashes white every 20 seconds and is visible 16 miles (26 km or 30 km). A radiobeacon was established at the station in 1939. As of June 2012, the light has been added to the lighthouse Doomsday List. In July 2014, the lighthouse and two keepers' quarters were moved from Cape San Blas to George Core Park in Port St. Joe. Cape San Blas Light The Cape San Blas Light is a lighthouse in the state of Florida in the United