The ones next to the moohphase icons?
There little bits of a satellite picture from the future.
The Canadian Meteological Center runs a big computer simulation
that predicts cloud cover in canada for up to 48 hours in
The calendar on this group automatically links to the right
CMC prediction page for the evening of the event date.
The little blue icons mark which calendar items are within the
48 hour precdiction range of CMC. If you look closely you'll
see that they are slightly different. They are actually little
bit of the real forcast image. The wiggly black line is
the ottawa river. If you click on the calendar event link,
you'll goto a page with event details and a bigger cloud forcast
The point is that we can use the CMC images to get an idea
if its going to be clear on the night of a starparty.
Seeing 48 hours into the future is pretty cool, I think.