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| abstraction > mathematical concept > number > quantity > angle > elongation > planetary elongation | 
| planetary elongation comparison table | ||||
| Subject | has definition | has elongation | is a kind of | is an instance of | 
|---|---|---|---|---|
| greatest elongation | The instants when the geocentric angular distances of Mercury or Venus are at a maximum from the Sun. | varies | planetary elongation event | planetary elongation | 
| planetary elongation event | A point in the orbit of a celestial body with a specific planetary elongation such as 0°, 90° or 180° | planetary elongation | 
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