Hipparchus for earlier Greek models ), planetary longitude corrections for different terrestrial locations, and a theory of lords of the hours and days ( an astrological concept used for determining propitious times for action ).
2.
Therefore, over this restricted range of years is an approximation to EOT whose error is in the range 0.1 to 2.5 s depending on the longitude correction in the equation of the equinoxes; for many purposes, for example correcting a sundial, this accuracy is more than good enough.
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