Harvard College Observatory
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- Subject
- Variable stars. 29
- Astronomy -- Observations. 9
- Asteroids. 5
- Astronomical clocks -- United States. 5
- Chronograph. 4
- Astronomical photometry. 3
- Meteors. 3
- Solar eclipses -- Observations. 3
- Comets. 2
- Longitude -- Measurement -- History. 2
- Milky Way 2
- Sun -- Research. 2
- Asteroids--Orbits. 1
- Astronomical instruments 1
- Boyden Station (Arequipa, Peru) 1
- Nebulae. 1
- Stars -- Clusters. 1
- Telescope -- 12-Inch Metcalf 1
- Time -- Systems and standards -- United States. 1
- Women astronomers--United States 1 ∧ less
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