Examples:
* The ecliptic plane is the plane of Earth's orbit around the Sun.
* The Moon's orbit is inclined at an angle to the ecliptic.
However, "ecliptic" can also be used as a noun, referring to the apparent path of the Sun across the celestial sphere as seen from Earth.
Examples:
* The Sun's apparent path across the sky is called the ecliptic.
* The planets are always found near the ecliptic.
Therefore, the part of speech for "ecliptic" depends on the context of its use.