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Seventeen Astronomical Observatories

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Pacific Press Publishing Association · Mountain View, California · Jun 30, 1909

FromSigns of the Times, Vol. 36, No. 25.

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Seventeen Astronomical Observatories

Seventeen Astronomical Observatories are cooperating in the compilation of a great map of the sky. This work has been going on for the past twenty-two years; each observatory charting the portion of the heavens under its observation, by means of photography. Over 22,000 negatives have been taken and over 2,000 of these have now been engraved on copper.