Obliquity of The Ecliptic

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Obliquity of The Ecliptic

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The angle between the plane of the ecliptic (the plane of the earth's orbit) and the plane of the celestial equator. </dd>
The obliquity of the ecliptic is computed from the following formula: 23 degrees 27 minutes 08.26 seconds - 0.4684 (t - 1900) seconds, where t is the year for which the obliquity is desired. </dd>

References

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