File:Astronomical quadrant, Museum Boerhaave Leiden.jpg

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English: Astronomical quadrant. Willem Janszoon Blaeu. Amsterdam ca. 1610. 6500. Manufactured for Professor Willem Snel van Royen, better known as Snellius (1580-1626). Was used to measure the latitude of Alkmaar and Bergen op Zoom. Using the known distance between the towns he was able to calculate the diameter of the earth. After Snellius's death the instrument was purchased by the University for its observatory. The telescope was added in 1669. In the Museum Boerhaave Leiden.
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Author Photograph by Mike Peel (www.mikepeel.net).
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This image was taken using a Canon EOS 60D with a Sigma 18-200mm F3.5-6.3 DC OS lens.

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current19:14, 3 August 2014Thumbnail for version as of 19:14, 3 August 20143,698 × 3,346 (3.73 MB)Mike Peel (talk | contribs){{subst:User:Mike Peel/Template | desc = {{en|Astronomical quadrant. Willem Janszoon Blaeu. Amsterdam ca. 1610. 6500. Manufactured for Professor Willem Snel van Royen, betten known as Snellius (1580-1626). Was used to measure the latitude of Alkmaar an...

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