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Subclass QB
| QB1-991 | Astronomy | ||
| QB1-139 | General | ||
| QB140-237 | Practical and spherical astronomy | ||
| QB275-343 | Geodesy | ||
| QB349-421 | Theoretical astronomy and celestial mechanics | ||
| QB455-456 | Astrogeology | ||
| QB460-466 | Astrophysics | ||
| QB468-480 | Non optical methods of astronomy | ||
| QB495-903 | Descriptive astronomy | ||
| QB500.5-785 | Solar system | ||
| QB799-903 | Stars | ||
| QB980-991 | Cosmogony. Cosmology | ||
