| | # {{astronomy|celestial mechanics}} The angle ''PFC'' formed by ''P'' = the [[periapsis]] of a celestial body's elliptical orbit, ''F'' = the [[focus]] of that orbit, and ''C'' = the current position of the celestial body. | | # {{astronomy|celestial mechanics}} The angle ''PFC'' formed by ''P'' = the [[periapsis]] of a celestial body's elliptical orbit, ''F'' = the [[focus]] of that orbit, and ''C'' = the current position of the celestial body. |
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