http://docs.openhab.org/addons/bindings/astro/readme.html#full-example
astro:sun:home [ geolocation="52.5200066,13.4049540,100", interval=60 ]
This also applies to the config via PaperUI:
Before the change: 56.123456,7.123456, after the change: 56.123456,7.123456,100 (where 100 is the altitude, but that is optional): openHAB 2.1 Release Notes · openhab/openhab-distro Wiki · GitHub
So if you have things files for astro and are using altitude, you have to adapt those.
BTW, my offsets and channel triggers are working fine with 2.1 and now 2.2 …
Also note another issue with the astro binding (if openHAB or the binding hasn’t been restarted for a while):
https://github.com/eclipse/smarthome/issues/3809