Cees BassaJan 4, 2025
For the 4th year in a row, my all-sky camera has been taking an image of the sky above the Netherlands every 15 seconds. Combining these images reveal the length of the night changing throughout the year, the passage of clouds and the motion of the Moon and the Sun through the sky. #astrophotography
Show threadCelloMom On CarsJan 4, 2025

@cgbassa

The moon! 😍

(Can you explain the asymmetry at the bottom of the image? Why is the time of sunset so constant in December?)

Show threadLeo Ré JorgeJan 4, 2025
@CelloMomOnCars @cgbassa my understanding is that it's mostly about the change in solar noon (from the varying speed of the earth along its orbit around the sun) partly compensating the change in day length. https://www.timeanddate.com/astronomy/equation-of-time.html has a more technical explanation
Equation of Time

The difference between the time measured by the Sun and the time measured by our clocks is known as the equation of time.

Show threadCelloMom On Cars

@LeoRJorge @cgbassa

Wow that's fascinating!
Thanks for the link.

(Remind me to help protect this planet, it's a cool planet).

Jan 4, 2025 at 4:55pmWeb