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Bettini method (1660) The JesuitMario Bettini penned a method which was posthumously published in the book Recreationum Mathematicarum Apiaria Novissima 1660.

  • Draw the gnonomic triangle with the hypotenuse against the meridian line, and φ to the bottom, C. The other point call M, the right angle call G.
  • A horizontal line is drawn through M, this is the equinoctial
  • A circle centred an M with a radius MG is drawn. G2 and G3 are the intersections of the circle and meridian.
  • In the top quadrants, points are marked each 30°. Two are named P, Q.
  • Construction lines are drawn from G2 and G3 through P and Q- the intersections with the equinoctial are marked.
  • To finish the hourlines are drawn through these points from C, and the dial squared off.
The afternoon dial is a reflection of this
Source Own work
Author Photograph by Clem Rutter, Rochester, Kent. (www.clemrutter.net).
Permission
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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 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 please get in touch.

If you use this image outside of the Wikimedia projects, then I'd appreciate it if you would let me know. Though this isn't compulsory, it seems only fair . Thanks!

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current16:16, 14 September 2015Thumbnail for version as of 16:16, 14 September 20151,576 × 975 (49 KB)ClemRutter

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