Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

equation of light




A correction to allow for the time it takes light to cross Earth's orbit. It is important when recording events such as stellar occultations, since the timing could be off by as much as 17 minutes depending on Earth's orbital position. For some events within the Solar System, such as eclipses of planet's satellites, account must also be taken of the position of the planet and its moons.


Related category

   • CELESTIAL MECHANICS