A new button in v1.1 up on the beta site:
When enabled, the time will change automatically to play back a 6-hour animation loop.
Why 6 hours? It feels like a good balance between the typical duration of a day hike and shoot, or a full night of astrophotography vs. avoiding looping to too long and loading a gazillion map tiles.
Depending on your internet connection, it might take a loop or so before all the tiles are loaded, but the looping makes it easy to sit back and just watch.
You might want to set the start time to an hour or so before sunrise or moonrise, for example, and see how the weather evolves.
Let me know what you think - eager to hear your suggestions and feedback as always.