More on mean solar time from Fact Monster:

• solar time - solar time solar time, timedefined by the position of the sun. The solar day is the time it takes ...
• tropical year - tropical year tropical year, time between successive vernal equinoxes; 365 days, 5 hr, 48 min, 46 ...
• year - year year, timerequired for the earth to complete one orbit about the sun. The solar or tropical ...
• sidereal year - sidereal year sidereal year, time required for the earth to complete an orbit of the sun relative ...
• anomalistic year - anomalistic year anomalistic year , time required for the earth to go from the perihelion point ...

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