Clear Sky Clock

The Clear Sky Clock shows forecasts for astronomers. They detail Cloud Cover,  Transparency and Seeing.  The predictions are hour by hour and provide data not available anywhere else.

For a larger view and more information click on the chart.

CSM's Observatory in San Mateo Ca.


Chanan Greenberg's Observatory in  Sunnyvale Ca. 


Richard Bennion's Observatory in Belmont Ca.



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