Encyclopedia > Wikipedia:Dewey Decimal System 52

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Wikipedia:Dewey Decimal System/52

Dewey Decimal System > 5 Natural Sciences and Mathematics > 52 Astronomy and Allied Sciences

520 Astronomy and Allied Sciences

521 Celestial mechanics

522 Techniques, equipment, materials[?]

523 Specific celestial bodies and phenomena[?]

524 Not Used

525 Earth[?] (Astronomical geography)

526 Mathematical geography[?]

527 Celestial navigation[?]

528 Ephemerides[?]

529 Chronology[?]

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