Year

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Year

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A period of one revolution of the earth around the sun. </dd>
The period of one revolution with respect to the vernal equinox, averaging 365 days 5 hours 48 minutes 45.68 seconds in 1955, is called a tropical, astronomical, equinoctial, natural, or solar year. The period with respect to the stars, averaging 365 days 6 hours 9 minutes 9.55 seconds in 1955, is called a sidereal year. The period of revolution from perihelion to perihelion, averaging 365 days 6 hours 13 minutes 53.16 seconds in 1955, is an anomalistic year. The period between successive returns of the sun to a sidereal hour angle of 80 degrees is called a fictitious or Besselian year. A civil year is the calendar year of 365 days in common years, or 366 days in leap years. A light year is a unit of length equal to the distance light travels in one year, 9.460 X 10E12 kilometers. The term year is occasionally applied to other intervals such as an eclipse year, the interval between two successive conjunctions of the sun with the same node of the moon's orbit, a period averaging 346 days 14 hours 52 minutes 52.23 seconds in 1955, or a great or Platonic year, the period of one complete cycle of the equinoxes around the ecliptic, about 25,800 years. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use