Mastodawn

Happy new year! During 2025 my all sky camera imaged the sky every 15 seconds, and this picture shows what happened in the sky. It shows the length of the night and day with the hourglass shape, the monthly lunar cycle with the diagonal bands, the elevation of the Sun at local noon, and lots of clouds.

Thomas Telkamp Jan 3

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Tammo Jan Dijkema

Here's a high-resolution zoomable version of the 'hourglass' photo by @cgbassa: https://astron.nl/~dijkema/keogram/
This is a compilation of over two million images, taken by Cees' all-sky camera over the course of 2025. There is a wealth of stuff to find in this dataset, for example one can see bright stars, Jupiter and Mars pass the camera. And of course, being taken from NL, a lot of clouds. Happy exploring!