Editing Mean anomaly (section)

===Mean anomaly at epoch===
The ''mean anomaly at epoch'', {{mvar|M}}{{sub|0}}, is defined as the instantaneous mean anomaly at a given [[Epoch (astronomy)|epoch]], {{mvar|t}}{{sub|0}}. This value is sometimes provided with other orbital elements to enable calculations of the object's past and future positions along the orbit. The epoch for which {{mvar|M}}{{sub|0}} is defined is often determined by convention in a given field or discipline. For example, planetary ephemerides often define {{mvar|M}}{{sub|0}} for the epoch [[J2000]], while for earth orbiting objects described by a [[two-line element set]] the epoch is specified as a date in the first line.<ref>{{Cite web |title=Space-Track.org |url=https://www.space-track.org/documentation#/tle |access-date=2024-08-19 |website=www.space-track.org}}</ref>