In celestial mechanics, the true anomaly is an angular parameter that defines the position of a body moving along a Keplerian orbit. It is the angle between the direction of periapsis and the current position of the body, as seen from the main focus of the ellipse (the point around which the object orbits).
The true anomaly is usually denoted by the Greek letters or, or the Latin letter .
The true anomaly is one of three angular parameters ("anomalies") that define a position along an orbit; the other two being the eccentric anomaly and the mean anomaly.
Famous quotes containing the word true:
“Who should come to my lodge this morning but a true Homeric or Paphlagonian man,—he had so suitable and poetic a name that I am sorry I cannot print it here,—a Canadian, a woodchopper and post-maker, who can hole fifty posts in a day, who made his last supper on a woodchuck which his dog caught.”
—Henry David Thoreau (1817–1862)