stargazing: vr 24 okt 21u geannuleerd
https://www.swpc.noaa.gov/products/aurora-30-minute-forecast
https://www.poollicht.be/
https://www.spaceweatherlive.com/en/auroral-activity/aurora-forecast.html
https://www.gi.alaska.edu/monitors/aurora-forecast
https://www.aurorasaurus.org/
