[SQM] Earth Hour is coming! Small effort/big difference!
cwalker at noao.edu
Thu Mar 20 21:40:41 UTC 2008
GREAT OPPORTUNITY! YOUR HELP COULD REALLY MAKE A DIFFERENCE!
On March 29 from 8 to 9pm many cities around the world will
participate in “Earth Hour” (www.earthhourus.org). From the Earth
Hour webpage they ask “How can we inspire people to take action on
climate change? … Chicago will serve as the U.S. flagship city for
Earth Hour in 2008, with Atlanta, Phoenix and San Francisco joining
as leading partner cities. But everyone throughout the US and around
the world is invited and encouraged to turn off their lights for an
hour on March 29 at 8 p.m. local time--whether at home or at work,
with friends and family or solo, in a big city or a small town. …
To alter the course of climate change we must act now. The U.S. is
the world's leading emitter of carbon dioxide—over 20 tons per person
every year. One person committed to reducing energy consumption can
make a difference, and millions of us working together can change the
If your community is participating in Earth Hour, as an SQM user
consider taking measurements of at least zenith during Earth Hour.
This is what the Tucson community is doing:
When would you take the measurements?
1) On March 29th, the night of the event:
a. Between 7:30 and 7:45 pm (to avoid sunset)
b. Between 8:15 and 8:45 pm (Earth Hour is 8 to 9 pm)
c. Between 9:15 and 9:45 pm
2) On March 28th and/or 30th between 8:15 and 8:45 pm.
1) Near any participating location – downtown for instance.
2) Or from your home, if your neighborhood is participating
3) Or at your school, if the school and surrounding area are
How will you take the measurements?
1) Take a measurement at zenith (straight overhead or “0 degrees”).
2) If you have the new SQM-L model (which enables measuring of
smaller parts of the sky), also face downtown Tucson or Phoenix
(depending on which city you’re in) and take a measurement halfway
down between zenith and the horizon (45 degrees). Then take a
measurement halfway between that point and zenith (22.5 degrees).
Clear (and Dark) Skies!
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