Copernicus animated with grokimagine.ai

I'm back to silicon microelectromechanical systems
(MEMS) in Neuchâtel, Switzerland.

🌞 It's the summer solstice in the Northern Hemisphere —
the perfect time to try a DIY physics experiment: Observing the Fraunhofer absorption lines of the Sun.

With the naked eye, you can clearly observe dark lines — these are the Fraunhofer absorption lines in the solar spectrum.

Mars orbits the Sun in 687 days, nearly twice Earth's 365-day orbital period. Mars' apparent retrograde motion occurs approximately every two years, when Earth catches and passes Mars.

🔗 observablehq.com/@christophe-...