Caption: "Pythagoreans celebrate sunrise."

This image may be totally fictitious. It is certainly an example of the 19th century idealization of ancient Greece and of 19th century artistic Philhellenism.

But the Pythagoreans did have rituals, and so something like this may have gone on. So faute de mieux.

Credit/Permission: Fyodor Bronnikov (1827--1902), 1869 (uploaded to Wikipedia by User:Alex Bakharev, 2007) / Public domain.
Image link: Wikipedia: File:Bronnikov gimnpifagoreizev.jpg.
Local file: local link: pythagorean_sunrise.html.
File: Ancient Astronomy file: pythagorean_sunrise.html.