ecliptic longitude


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Related to ecliptic longitude: celestial longitude

ecliptic longitude

ecliptic longitude

n
(Astronomy) astronomy another name for celestial longitude
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However, because the Moon (and to a lesser extent the other planets) cause the true motion of the Earth to vary from a perfect ellipse, the equinox is now officially defined by the Sun's more regular ecliptic longitude rather than latitude.
Not only does our continuing survey now cover most areas of ecliptic longitude on the sky, but we have also discovered two more extreme objects, called 2013 [FT.sub.28] and 2014 [SR.sub.349].
where [r.sub.d], [[THETA].sub.d], and [[omega].sub.d] are the selected orbital radius, ecliptic latitude, and ecliptic longitude velocity of displaced orbit, respectively.
Saturn becomes stationary in right ascension and ecliptic longitude on August 25th.
Modern observers usually assume it refers to greatest separation in ecliptic longitude, but it's unclear what was used historically.
Here, conjunctions are considered to occur when the planets actually appear closest together in the sky (at appulse), not merely when they share the same ecliptic longitude or right ascension.