[sotd] June 22, 2005 [Clear Sky Clock]
- From: "The Site of the Day" <sotd@xxxxxxxxxxxxxx>
- To: sotd@xxxxxxxxxxxxx
- Date: Wed, 22 Jun 2005 09:57:47 -0300
Site of the Day for Wednesday, June 22, 2005
Clear Sky Clock
With the launch and current uncertainty of the disposition of the Cosmos 1
satellite (whose website was past featured as a Site of the Day), many long
term Gentle Subscribers may be keeping an eye trained heavenward. To aid
their satellite watch, today's site, from Attilla Danko, with the
assistance of Canadian meteorologist Allan Rahill, provides essential
information on determining when the night sky offers clear viewing
conditions.
"What is it? ... It's an attempt to show at a glance when, in the next 48
hours, we might expect clear and dark skies for one of many observing sites
... It's is specifically intended for amateur astronomers. The forecast
data comes from a numerical weather model run by those very cool guys at
the Canadian Meteorological Centre. ... Are there Clocks for other
locations? Yes, hundreds. The coverage area is Canada, USA and parts of
Mexico." - from the website
The site offers data on not only major centers but on out-of-the-way
locales from Alberta to Wyoming; those living more than 15 miles from a
current clock may request data for their locations. The more than 2000
clocks are searchable by keyword, longitude and latitude position, map and
are browsable as well. The data is presented as a large colored diagram
with an explanation of the color coding for ground and sky conditions,
including the essentials of cloud cover, transparency, a calibrated
darkness scale and seeing levels in relation to each hour. Specific clock
locations offer direct links to a light pollution map of the area, among
other relevant sky watching topics.
Zoom over to the site for North American sky watching conditions at:
http://cleardarksky.com/csk/
A.M. Holm
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