Answers to my Quiz

The armillary sphere is wrong, because the obliquity is too big. The ecliptic runs between the arctic and antarctic circles instead of the tropics. Compare with the picture on the right. I have a separate page about such “Fake” Armillary Spheres.


Helmer Aslaksen
Department of Mathematics
National University of Singapore
helmer.aslaksen@gmail.com

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