| 21. | He started with his observations of double stars in 1925.
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| 22. | It was set up specifically to search for double stars.
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| 23. | A telescope shows that Alpha 1 and Alpha 2 are both double stars.
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| 24. | In 1899 the astronomer Karl Schwarzschild pointed out an observation about double stars.
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| 25. | This configuration is similar to the optical double star.
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| 26. | Since this time, many more double stars have been catalogued and measured.
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| 27. | South then continued and observed another 458 double stars over the following year.
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| 28. | He discovered a number of double stars and took many photographs of Mars.
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| 29. | He continued Struve's observations of double stars.
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| 30. | There are several other noteworthy stars in Eridanus, including some double stars.
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