Hello!
Interesting project - I just wonder about the selection of observatories. If I look at Heilbronn, there is the Experimenta Sternwarte, which is open at daylight and sometimes does public observations in the evening, but is so far not further accessible for provate observations, while the much older Robert-Mayer-Sternwarte (sternwarte.org), which is managed by a club where you can become a member and use the telescopes, is not mentioned.
At first glance, so far there are only observatories listed?
What I would expect is an overlay with the lightpollution like at https://www.lightpollutionmap.info.
Best regards,
Alex
