Incelestial mechanics,true longitude is theecliptic longitude at which an orbiting body could actually be found if itsinclination were zero. Together with the inclination and theascending node, the true longitude can tell us the precise direction from the central object at which the body would be located at a particular time.

The true longitudel can be calculated as follows:^[1][2][3]

l =ν +ϖ

where:

• ν is the orbit'strue anomaly,
• ϖ ≡ω +Ω is thelongitude of orbit's periapsis,
  • ω is theargument of periapsis, and
  • Ω is thelongitude of the orbit's ascending node,

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