Clear Sky Clock Page Added

To the Astronomy tab I have recently added the Clear Sky Clock page.

The Clear Sky Clock can show at a glance when, in the next 48 hours, we might expect clear and dark skies for one of many observing sites closest to Rock Hall, MD, in this case The United States Naval Academy, Annapolis, MD USA.

It's is intended for amateur astronomers. The forecast data comes from a numerical weather model run by the Canadian Meterological Centre.