Assertion: planet's body | /r/Synonym | the periapsis
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Source sentences:
text: -\theta _{0}))} for any non-negative e {\displaystyle e} eccentricity; here θ {\displaystyle \theta } true anomaly, which is the angle between the current position of the orbiting object and the location in the orbit at which it is closest to the central body (called the periapsis).