EntityQ2444002· pop 20· linked from 3,000 articlessynodic daySign in to saverotation period of a body relative to the primary object it orbits, e.g. solar dayConnectionsretrograde motionEntityEarthConceptSunConceptMoonConceptVenusEntitystarEntityMercuryEntitydayEntityInternational Standard Book NumberEntitylongitudeEntityNorthern HemisphereEntityspacecraftEntityorbitEntitySouthern HemisphereEntityastronomical objectEntitynoonEntitydigital object identifierEntityInternational Standard Serial NumberEntitysolsticeEntityeclipticEntityCategoriesAstronomyUnits of time