Cees BassaHappy 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.
This is the second year that this all-sky camera, consisting of a @Raspberry_Pi computer and a ZWO CMOS camera, ran continuously for a year. Compare the 2022 year-long keogram with that of 2021.
The hourglass shape hardly changes, but the diagonal bands are shifted, as the full Moons occur on different days. The cloud patterns are obviously also different, though generally winter has worse weather (more clouds) than summer.
berndandeweg@cgbassa there is soooo much to see in these pictures. 2022 has long blue stretches, as you would expect from a year with nearly 20% more solar energy production.