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retrograd bevægelse er når et himmellegeme bevæger sig i den modsatte retning af hvad himmellegemer normalt gør indenfor et givet system.
retrograde motion is the orbital motion of a body in a direction opposite that which is normal to spatial bodies within a given system.
astronomer bruger flux til at bestemme hvor klart et himmellegeme lyser. den tilsyneladende klarhed er defineret som som mængden af lys pr sekund i et enhedsområde der modtages fra et himmellegeme målt udenfor atmosfæren. derfor er en stjernes tilsyneladende klarhed bare den flux vi modtager fra stjernen.
astronomers use flux to denote the apparent brightness of a celestial body. the apparent brightness is defined as the amount of light received from a star above the earth atmosphere passing through a unit area each second. therefore, the apparent brightness is simply the flux we receive from a star.
traktat om principper for staters virksomhed ved udforskning og udnyttelse af det ydre rum, herunder månen og andre himmellegemer
treaty on principles governing the activities of states in the exploration and use of outer space, including the moon and other celestial bodies
