Light Year (ly)
Definition: A light-year (ly) is the distance light travels in one Julian year (365.25 days), approximately 9.461 trillion kilometers or 5.878 trillion miles. It is used for measuring astronomical distances.
History: The term 'light-year' was first introduced in the 19th century to help astronomers express cosmic distances. It replaced astronomical units that were cumbersome for measuring vast space distances.
Current Use: Light-years are used in astronomy to describe distances between stars, galaxies, and other celestial objects. It is crucial for understanding the scale of the universe and cosmic events.
Foot (ft)
Definition: A foot (ft) is an imperial unit of length equal to 0.3048 meters or 12 inches. It is widely used in real estate, construction, and aviation for measuring height and distances.
History: The foot has been used as a unit of length since ancient times, originally based on the length of a human foot. It was standardized to 12 inches in England during the 13th century.
Current Use: Feet are commonly used in the US, UK, and Canada for measuring heights of buildings, doorways, and human stature. It remains an important unit in architecture and sports field measurements.
Quick Conversion Table Light Year (ly) to Foot (ft)
1 Light Year (ly) equal to 3.10385e+16 Foot (ft)
5 Light Year (ly) equal to 1.55192e+17 Foot (ft)
10 Light Year (ly) equal to 3.10385e+17 Foot (ft)
20 Light Year (ly) equal to 6.20770e+17 Foot (ft)
30 Light Year (ly) equal to 9.31154e+17 Foot (ft)
50 Light Year (ly) equal to 1.55192e+18 Foot (ft)
75 Light Year (ly) equal to 2.32789e+18 Foot (ft)
100 Light Year (ly) equal to 3.10385e+18 Foot (ft)