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A great circle on the celestial sphere representing the sun's apparent path during the year, so called because lunar and solar eclipses can only occur when the moon crosses it.
- ‘A lunar eclipse occurs at full moon when the Moon crosses the ecliptic in opposition to the Sun.’
- ‘The other planets though also move across the sky on paths close to the ecliptic.’
- ‘The Moon's Nodes are points in space representing the points where the moon's orbit around the earth crosses the ecliptic.’
- ‘Comets in this group, called the Jupiter family comets, revolve around the Sun near the plane of the ecliptic in the same direction as Earth's orbit.’
- ‘An eclipse occurs only if the Moon crosses the ecliptic when very close to either conjunction or opposition, respectively producing solar and lunar eclipses.’
Of an eclipse or the ecliptic.
- ‘Lunar eclipses occur at the time of a Full Moon, and when the Moon is near one of the nodes of intersection between its orbit and the ecliptic plane.’
- ‘Another eight years later the node has moved beyond the ecliptic limit, and no transit can take place.’
- ‘The required coincidence of a conjunction with the ecliptic crossing of Venus has some latitude because the solar disc is so much bigger than the image of Venus.’
- ‘Second, and more significant, eclipses do not necessarily occur precisely on the node, but rather there is a range of possible positions called the ecliptic limits.’
- ‘There are also tables which give transformations between different coordinate systems on the celestial sphere, in particular allowing ecliptic coordinates to be transformed into equatorial coordinates.’
Late Middle English: via Latin from Greek ekleiptikos, from ekleipein fail to appear (see eclipse).
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