Astronomy · Catalogue
New General Catalog (NGC)
History of the NGC catalogue, its creation, Index Catalogue and the crossroads on individual object ranges.
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Space
Astronomy, observation catalogues and articles on sky movements and cycles.
Astronomy · celestial mechanics
Sun and Moon: changes in positions, tracks and lunar standstill
East and west azimuth, moon's slope, great lunar standstill, precession and verifiable observational effects.
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