UDC: 52 Astronomy. Astrophysics. Space research. Geodesy

| UDC Consortium, PO Box 90407, 2509 LK The Hague, The Netherlands Tel.: (+31) 70 314 0509 Fax: (+31) 70 314 0667 E-mail: udc@kb.nl

Common auxiliaries

## 5 Mathematics and natural sciences
52 Astronomy. Astrophysics. Space research. Geodesy

520 | Astronomical instruments and techniques
521 | Theoretical astronomy. Celestial mechanics
523 | The Solar System
524 | Stars. Stellar system. The Universe
528 | Geodesy. Surveying. Photogrammetry. Remote sensing, Cartography

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