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" ... Sun above the horizon proved to be a very important factor, so that the focus changed much more rapidly near noon than early in the morning. From the outset, the advantages of observing the Sun during the early morning hours had been apparent. In... "
Publications of the Astronomical Society of the Pacific - Page 74
by Astronomical Society of the Pacific - 1906
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Publications of the Astronomical Society of the Pacific, Volumes 17-18

Astronomical Society of the Pacific - 1905 - 606 pages
...the early morning hours had been apparent. In view of the difficulties that were being experienced, this point was again carefully investigated, and it...mirrors change their figure slowly. If the mirrors are shielded from sunlight between exposures of photographs, and if the exposure time is made as short...
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The Astrophysical Journal, Volume 23

1906 - 476 pages
...the early morning hours had been apparent. In view of the difficulties that were being experienced, this point was again carefully investigated, and it...mirrors change their figure slowly. If the mirrors are shielded from sunlight between exposures of photographs, and if the exposure time is made as short...
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The Astrophysical Journal, Volume 23

1906 - 460 pages
...the early morning hours had been apparent. In view of the difficulties that were being experienced, this point was again carefully investigated, and it...mirrors change their figure slowly. If the mirrors are shielded from sunlight between exposures of photographs, and if the exposure time is made as short...
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The Astrophysical Journal, Volume 23

1906 - 464 pages
...the early morning hours had been apparent. In view of the difficulties that were being experienced, this point was again carefully investigated, and it...mirrors change their figure slowly. If the mirrors are shielded from sunlight between exposures of photographs, and if the exposure time is made as short...
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Contributions from the Mount Wilson Observatory, Volume 1

Mount Wilson Observatory - 1908 - 594 pages
...the early morning hours had been apparent. In view of the difficulties that were being experienced, this point was again carefully investigated, and it...mirrors change their figure slowly. If the mirrors are shielded from sunlight between exposures of photographs, and if the exposure time is made as short...
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