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DDC classification

Dewey Decimal Classification: 10 main classes, 100 divisions and 1,000 sections. Click to browse the collection.

Main classes

2X

Divisions

Sections

  • 520Astronomy & allied sciences1
  • 521Celestial mechanics
  • 522Techniques, equipment & materials
  • 523Specific celestial bodies & phenomena
  • 524[Unassigned]
  • 525Earth (Astronomical geography)
  • 526Mathematical geography
  • 527Celestial navigation
  • 528Ephemerides
  • 529Chronology