Средняя долгота (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Средняя долгота" in Russian language version.

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archive.org

Meeus, Jean. Astronomical Algorithms. — Willmann-Bell, Inc., Richmond, VA, 1991. — С. 197—198. — ISBN 0-943396-35-2.
Smart, W. M. Textbook on Spherical Astronomy. — sixth. — Cambridge University Press, Cambridge, 1977. — С. 122. — ISBN 0-521-29180-1.