Fictitious Year

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Fictitious Year </dt>
The period between successive returns of the sun to a sidereal hour angle of 80� (about January 1). Also called Besselian ''year, Bessel fictitious year. </dd>
''The length of the fictitious year is the same as that of the tropical year, since both are based upon the position of the sun with respect to the vernal equinox. </dd>

References

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