Data and algorithms
光年
Light-year
Distance light travels in a year, 9.46 trillion km.
Proxima Centauri is 4.24 light-years away.
Related terms
- Sidereal time — Time measured against the vernal equinox.
- Astronomical unit — Earth–Sun mean distance, 149.6 million km.
- Parsec — Distance at one arcsecond parallax, 3.26 light-years.
- Declination — The celestial equivalent of latitude.