Mean longitude

epoch, 1850-01-01; mean longitude, 11.67°, perihileon longitude, 186°; eccentricity, 0.228, mean distance, 47.5 AU; long arc node, 110.99°; inclination 7.30°; and, mass, 1/21,000 solar masses.

1900 when the geometric mean longitude of the Sun referred to the mean equinox of data was 279 degrees 41 minutes 48.04 seconds. Ephemeris time is the measure of time in which Newcomb's Tables of the Sun agree with observation.

In the problems of celestial mechanics the angles within the parentheses are represented by sums or differences of multiples of the mean longitudes of the planets as they move round their orbits.

Methone is visibly affected by a perturbing mean longitude resonance with the much larger Mimas.

The period of one complete revolution of the mean longitude of the sun with respect to the dynamical equinox. The tropical year is longer than the Besselian year (see year, Besselian) by 0s.148 T, where T is centuries from B1900.0. Yellow Giant ...

See also: Element, Orbit, Epoch, Period, Longitude