The Clear Sky Clock is an online product of the Canadian Meteorlogical Service. They're graphical representations of the sky conditions you can expect over the day. Clear Sky Clocks are valuable tools for determining if you should take a trip to the observatory. That's because even if it's cloudy now, the sky may clear up later in the night. Consult the local Clear Sky Clock before leaving and you'll know whether you can expect the sky to clear up during the night. For detailed information on the Clear Sky Clock, go to the Clear Sky Clock home page.