נושאים מוצעים
- Spherical astronomy
- Astronomy, Greek 2 results
- Early works to 1800 2 results
- Angle 1 results
- Astronomers 1 results
- Astronomical instruments 1 results
- Astronomy 1 results
- Celestial sphere 1 results
- Coordinates 1 results
- History 1 results
- Mathematics 1 results
- Measurement 1 results
- Observations 1 results
- Sphere 1 results