General information

Longitude of the tropical mean Sun
Table type		Sun Mean motion solar tropical longitude
Table type definition		Solar mean motion in tropical coordinates
Intellectual author		Jean-Claude Penin
Bibliography		Chabas, J. and Goldstein B.R. A survey of European astronomical tablesin the late Middle Ages. 2012.Leiden, Boston Brouwer D. and Clemence G.D. Methods of Celestial Mechanics. New york and London. 1961
Author of the record		jpenin

Formula definition definition

Formula definitions are modern mathematical expressions of historical theoretical models, usually geometrically expressed, on which the different types of astronomical tables are based. They are used to suggest values when inputting tables content and to analyse mathematically table content.

Glossary

Formula definition : Longitude of the tropical mean Sun | Sun: Mean motion solar tropical longitude

Table model definition

Explanation

Mean longitude of the Sun related to ecliptic. It is a linear function of the time t.

Formula

\(\overline{m}=\mu \times t\)

Parameter

Value for 1 day		Undesignated parameter No default value provided

Modern definition

It is the mean anomaly l = n(t-T), t the time, n the mean motion of the tropical sun, T the instant of perihelion passage.

Parameter estimation tip

360 / length of tropical solar year