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- astronomical reference system
- astronomical refraction
- astronomical research
- astronomical satellite
- astronomical seeing
- astronomical sign
- Astronomical Society of Australia
- Astronomical Society of Japan
- Astronomical Society of Southern Africa
- Astronomical Society of the Pacific
- astronomical spectral analysis
- astronomical spectrograph
- astronomical spectrometry
- astronomical spectrophotometer
- astronomical spectrophotometry
- astronomical spectroscope
- astronomical spectroscopy
- astronomical symbols
- astronomical technique
- astronomical telegram
- Astronomical telescope
- astronomical telescope
- astronomical test
- astronomical tests of general relativity
- astronomical theodolite