- 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.
- 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.
- 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.
- The other planets though also move across the sky on paths close to 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.
- The Moon's Nodes are points in space representing the points where the moon's orbit around the earth crosses the ecliptic.
- A lunar eclipse occurs at full moon when the Moon crosses the ecliptic in opposition to the Sun.