“Fake” Armillary Spheres

Do you notice anything wrong about these two pictures? The armillary spheres are wrong! The ecliptic links the arctic and antarctic circles instead of the tropics!

Frontpiece of the 1699 Latin edition of the Dialogo Adam Schall (1591-1666), Imperial Astronomer in Beijing
Front piece of the 1699 Latin edition of the Dialogo Adam Schall (1591-1666), Imperial Astronomer in Beijing

The front piece from the original Italian edition of the Dialogo from 1632 has a correct armillary.

Frontpiece from the original Italian edition of the Dialogo from 1632

Armillary sphere links

Armillary sphere

Back to the page for my course Heavenly Mathematics & Cultural Astronomy.


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

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