Happy new year! Another year means another year-long keogram! Every 15 seconds throughout 2022, my trusty all-sky camera took a picture of the sky above the Netherlands. Combining these 2.1 million images into a year-long keogram reveals this picture, which shows the length of the night change throughout the year (the hourglass shape), when the Moon was visible at night (diagonal bands), and the Sun higher in the sky during summer, as well as lots and lots of clouds passing overhead.

@cgbassa Wow! I am truly in awe. Never heard of keograms, thank you for introducing that to me! This wonderful graphic overview about one year might be interesting for other people in my timeline who love #astronomy (I love it only as a hobby, but love is love), so I tag it.

Thank you for taking these pictures combining them and sharing the result!

@suvidu Thanks! It is a nice visualization of events in the night sky that we are all familiar with, but don't think about too much. Note that Sky and Telescope magazine publishes the sky gazers almanac which shows a similar shape. See my comparison of the 2021 keogram: https://twitter.com/cgbassa/status/1479485044574101517
Cees Bassa on Twitter

β€œIt's also interesting to compare the keogram to the @SkyandTelescope's Skygazer's Almanac for 2021. The Almanac is for 50 deg North, whereas I observed from 53 deg North. https://t.co/qwRepfY0S1”

Twitter
@cgbassa It is great, just accept it 😁
And thank you for the link!