The absolute value of the difference between the body's ecliptic longitude and the Sun's ecliptic longitude, both as seen from the center of the Earth. This angle measures around the plane of the Earth's orbit (the ecliptic), and ignores how far above or below that plane the body is. The ecliptic separation is measured in degrees and is always in the range [0, 180].
The angle in degrees, as seen from the center of the Earth,
of the apparent separation between the body and the Sun.
This angle is measured in 3D space and is not projected onto the ecliptic plane.
When elongation is less than a few degrees, the body is very
difficult to see from the Earth because it is lost in the Sun's glare.
The elongation is always in the range [0, 180].
The date and time of the observation.
Either "morning" or "evening",
indicating when the body is most easily seen.
The viewing conditions of a body relative to the Sun.
Represents the angular separation of a body from the Sun as seen from the Earth and the relative ecliptic longitudes between that body and the Earth as seen from the Sun.
See
Elongation