File:Astronomical quadrant, Museum Boerhaave Leiden.jpg
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Summary
| Description |
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. |
| Date | |
| Source | Own work |
| Author | Photograph by Mike Peel (www.mikepeel.net). |
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CC-BY-SA-4.0. Please attribute as per the author line above. |
| This image is licensed under a Creative Commons Attribution-Share Alike licence, which gives you permission to freely use the image for any purpose, so long as you attribute it as requested here, and you must make any modified versions of it available under an identical license.
If you want to use this image under a different license, for example if you can't give attribution or if you can't share a derivative work under the same licence, then I may ask for a small fee to do so, which will help me cover the cost of my photography equipment. If you use this image outside of the Wikimedia projects, then I'd appreciate it if you could let me know. This isn't compulsory, but it would be nice of you. You can contact me on-wiki or by this form 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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:14, 3 August 2014 | | 3,698 × 3,346 (3.73 MB) | Mike Peel | {{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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