Thinking about building a portable observatory...what are the options
for lightweight roof materials?

Thanks

"A pollster whose mathematical model has correctly predicted every winner
of the White House popular vote since 1988 is banking on a decisive victory
for Democrat Barack Obama in November.Emory University political scientist
Alan Abramowitz said Wednesday that according to his "time for change"
model, Obama would secure 54.3 percent of the popular vote against 45.7
percent for Republican John McCain.That margin would virtually guarantee a
crushing victory for the Democrat in the state-by-state electoral college
that actually selects the next president, Abramowitz said.He said unknown
variables, such as the nation's bitter partisan divide and resistance to
Obama's African-American race among some white voters, may result in a
slightly smaller popular vote margin for the Democratic nominee.But, "the
combination of an unpopular Republican incumbent in the White House, a weak
economy and a second-term election make a Democratic victory in November all
but certain," he writes in the October issue of the journal "PS: Political
Science and Politics.""The good news for Democrats is that 2008, unlike
2004, is a time-for-change election - one in which the president's party has
controlled the White House for two or more terms," Abramowitz said.His model
evaluated Republican President George W. Bush's dismal approval ratings, the
change in economic output in the second quarter of the election year, and
above all an anti-incumbency mood against the White House party."Regardless ...

You may be interested in this:
http://ScienceStage.com - The universal online portal for science,
advanced teaching and academic research.

ScienceStage.com is a virtual conference room, lecture hall,
laboratory, library, and meeting venue all in one. It offers new
methods of scientific presentation, scientific discourse and academic
knowledge transfer by using video streaming, audio streaming and text
features.

Space Weather News for Sept. 22, 2008
http://spaceweather.com

NEW SUNSPOT: For the first time in months, a significant sunspot is emerging on the sun.
It is a fast-growing active region with two dark cores, each larger than Earth. The
magnetic polarity of the sunspot identifies it as a member of new Sunspot Cycle 24.
Because the year 2008 has brought so many blank suns, some observers have wondered if we
are ever going to climb out of the ongoing deep solar minimum. Today's new sunspot is an
encouraging sign that the 11-year solar cycle is indeed progressing, albeit slowly.
Visit http://spaceweather.com for sunspot photos and updates.

SEPTEMBER EQUINOX: Seasons on Earth change much faster than they do on the sun. Today,
autumn begins in the northern hemisphere and spring in the southern hemisphere when the
sun crosses the celestial equator. The crossing, called the "equinox," takes place at
1544 UT (11:44 EDT) on Monday, Sept. 22nd. Happy equinox!

Kang Chung wrote:

The link is actually about the history of solar monitoring and answers
the question posed above rather thoroughly.

It just goes to show: you can lead a horse to a hyperlink, but you can't
make him click it. :-)

--
Greg Crinklaw
Astronomical Software Developer
Cloudcroft, New Mexico, USA (33N, 106W, 2700m)

SkyTools: http://www.skyhound.com/cs.html
Observing: http://www.skyhound.com/sh/skyhound.html
Comets: http://comets.skyhound.com

To reply take out your eye

Nights will soon be shorter than days for northern hemisphere
observers. Longer nights translate into more (dark sky) observing
time.

Happy Autumnal Equinox to all and to all a happy new observing season!

Bill Greer
To sketch is to see.

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