2 An Earth DaySidereal Day: 23 hr 56 min 4 sec Motion relative to background starsMean Solar Day: 24 hours The average time between meridian crossings of the SunApparent Solar Day: varies The actual time between the meridian crossings
10 An Earth YearBased on the motion of the Sun on the sky or the motion of Earth around the SunJulian Year: mean solar days. Used in calendars before 1582.Gregorian Year: mean solar days. Used in calendars today.
11 An Earth YearSidereal Year: mean solar days. Defined by the motion relative to stars.Anomalistic Year: mean solar days. Defined as perihelion to perihelion.Tropical year: mean solar days. Defined from equinox to equinox. Thus, related to the seasons.