زاوية وسط الشذوذ (Arabic Wikipedia)

Analysis of information sources in references of the Wikipedia article "زاوية وسط الشذوذ" in Arabic language version.

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archive.org

Montenbruck، Oliver (1989). Practical Ephemeris Calculations. Springer-Verlag. ص. 44. ISBN:0-387-50704-3.
Meeus، Jean (1991). Astronomical Algorithms. Willmann-Bell, Inc., Richmond, VA. ص. 182. ISBN:0-943396-35-2.