In association with the Northern Virginia Astronomy Club (NOVAC),
the Fairfax County Public Schools (FCPS) Planetarium Program presents...

The EarthDial Project • FCPS/NOVAC EarthDial Webcam
TJHSST Planetarium, Fairfax County, VA
38° 49' N latitude, 77° 12' W longitude

Day & Night Live!



The line that divides day & night is called the "terminator." As the Earth rotates counterclockwise, the terminator appears to move from east to west (right to left). See the current location of the subsolar point.
Graphic produced using Xearth.


See other EarthDials worldwide...


Image updated every 10 minutes on the 10s. Click Refresh/Reload.
Webcam page refreshes automatically every five (5) minutes.
Tell time by estimating the position of the center of the shadow of the nodus, the reddish ball located on top of the gnomon (vertical rod), cast among the hour lines. To correct Solar Time for Standard Time, refer to the Standard Time Correction table for Washington, D.C. Add one hour for Daylight Saving Time. See a larger version of the current image plus an archive of past images (including time-lapse animations).



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© Copyright 2004-2010 Walter Sanford. All rights reserved.