Aug 1 2008 TSE LIVE WEBCAST

Greetings Everybody.

Since we’re not getting a glimpse of totality here in Delhi, aaadelhi.org will try to Syndicate a webcast from LIVE from Novosibirsk, Russia. You can also check out the syndicated video webstream links from University of North Dakota, Grand Forks team in China. Webcast from Novosibirsk is scheduled to begin on Aug 10 2008, 0900 UTC 1430 IST

Syndicated Content
VIDEO STREAM 1 (Univ N.Dakota from China) CLICK HERE
VIDEO STREAM 2 (Univ N.Dakota from China) CLICK HERE
VIDEO STREAM 3 (Multicast) (Univ N.Dakota from China) CLICK HERE

External Webcast Links
Exploratorium TSE 2008: Live Form China


Click for Novosibirsk, Russia Forecast


Click for Xi'An, Shaanxi Forecast

Updates:

  • 0422 EST, Streams from China seem to work, they’ve gone off temporarily
  • 0438 EST, Link 1 from UND is up….We can see a solar disc….i wonder what ppl in Russia are doing. First contact at 1009UTC
  • 0445 EST,Clouds in Shaanxi in China look ominous! GULP!
  • 0458 EST,Coverage from Novosibirsk hasn’t started yet….i wonder if Murphy’s Law is at play!
  • 0551 EST,Clouds are looking bad in Xi’an, I’m keeping my fingers crossed
  • 0631 EST,Exploratarium has great video feeds, Mylar and H-alpha images galore…plus no clouds!
  • 0638 EST, Hoooray, ND has a feed, clouds giving wayto a solar disc..!!!!!….too bad we missed the 1st contact at 1026 UTC
  • 0708 EST, Totality in Xinjiang,China….People go Nuts…including me!!!!! :)))))
  • 0722 EST, Totality in Xian,China….North Dakota People manage to screw up the feed during totality….i lose the whole recording… 🙁
  • Well folks, now since the best part is over, I leave it to my faithful computer to record the remaining feed from Xinjiang

    Time to hit the sack folks!
    This is the end of our LIVE commentary

LIVE CHAT
This Webcast has Ended ! Thanks for visiting

Monsoon Eclipse: Aug 1 2008

In recent times most of the eclipses have been visible with a very small fraction of the Sun being seen as eclipsed, from India. The last total solar eclipse from India had not been too happy an experience, with most of the totality belt having been clouded out during the eclipse. We now have the eclipses of 2008 and 2009, also falling in the monsoon season, and will therefore need to gear up and scan Indian Geography and its monsoon vagaries very carefully, to decide where we are going to be, to observe the 2009 Total Solar Eclipse.


Photo Courtesy: Ajay Talwar

The August 1st 2008 Total Solar Eclipse will be seen as a partial eclipse from India, so perhaps people might not travel to different locations in India, for this eclipse, and will more likely want to know what are the chances from their home location, of viewing this eclipse. Before we discuss anything else, it is very important to emphasise that viewing the eclipse with naked eyes would be very dangerous for the eyes. Viewing the Sun through a telescope or a binoculars without a proper filter is many times more dangerous – do not ever do that, it could destroy your eyesight. The safest way of viewing a partial solar eclipse is through the method of projection. Let us now, look at the circumstances of the August 1st 2008 eclipse, for different locations in India. We may be missing the totality of this eclipse, but, the northern parts of India do get to see a large fraction of the disc of the Sun eclipsed.

In this figure, adapted from http://eclipse.gsfc.nasa.gov/SEpath/SEpath2001/SE2008Aug01Tpath.html
The path of totality is marked in dark blue, and passes well to the North of India. The dark green lines indicate regions where the eclipse will start at the times indicated. These timings are in Universal Time (UT) to which we need to add 5.5 hours to obtain the Indian Standard Time. The light blue lines are contours of constant Eclipse Magnitude.




The Eclipse Fraction is defined as the fractional diameter of the Sun eclipsed, at the maximum of eclipse at any given point. The southern parts of the country will see between 20 -40 % eclipse fraction, the central regions between 40-60 % while the Northern parts of the country see between 60-70 eclipse fraction, at maximum, during the 2008 eclipse. There is another way of looking at a partial eclipse – through a quantity known as the Obscuration Fraction. The obscuration fraction is the fractional area of the disk of the Sun covered by the disk of the Moon. For Delhi, for instance, the eclipse magnitude is 62.26 % while the maximum obscuration fraction is 53.7 %. Using the box projection apparatus mentioned above, and by projecting an image of the Sun on to a graph sheet and photographing that image, one can make some estimates of the obscuration fraction as the eclipse progresses from beginning to end and check them against known theoretical values. Try it, it is great fun!
Here is a graph of the measured obscuration fraction of the eclipse of March 2006, compared with theoretical values. The measurement and comparisons were done by members of the Amateur Astronomers Association, Delhi, at an eclipse skywatch organized at the Nehru Planetarium, New Delhi.

The binocular/pinhole box projection apparatus can also be used to measure the relative angular diameter of the Sun and the Moon, using simple school geometry. To learn how to make a simple pinhole camera click here http://www.aaadelhi.org/node/7 This is an exciting activity to do, if we are located in the partial zones of a total or an annular eclipse. With such a measurement we can discern whether the eclipse is total or annular, in the central belt, even if we are situated far from the central belt. A kind of a celestial ventriloquism that we can practice 🙂

We might also be able to measure the position angle of the first contact point, with such an apparatus, if there is a sunspot visible on the day of the eclipse. The First contact is the very beginning of the eclipse as the first dent or a miniscule bite appears to have been taken out of the Sun – the first external tangency between the Moon and the Sun, as seen from a given location. The position angle of this contact point is defined as the contact angle measured counter-clockwise from the north point of the Sun’s disk.

There, we are all set, if we manage to do this carefully and obtain our East-West and North-South axis on our projected image that we capture just at first contact, we should be able to pull out the position angle of the first contact reasonably accurately.
So, go ahead and make your binocular box projection apparatus, or a simple projection apparatus for a telescope with a stand, and enjoy watching the eclipse safely. Be sure to do a little something quantitative, with measurement of some eclipse related parameters, to enhance your enjoyment of the eclipse! And look ahead, to the July 22nd 2009 Total Solar eclipse in India.

Some Tips on Solar Safety can be found on this page
http://www.aaadelhi.org/?q=node/6

Penned by Dr N Rathnasree, This article also appears in a Forthcoming issue of Krittika

Hard Proof: Water found on Mars

Check out this stunning picture taken by NASA’s Phoenix Lander. The probe had been digging for some days around the planets icy poles, and guess what….you’re looking at….H20 ICE!….yes folks…this is 100% water ice. The atmospheric pressure on Mars is so low, that ice directly vaporizes without forming liquid water

How can we be sure….?

The average temperature at the poles is about -70F (-56 C) and dry ice ( the other plausible candidate ) needs much lower temperatures to exist.

Beat the Heat!

Greetings Everyone

Its June 21……

Jogging your memory, today is the longest day of the year, and probably, if you live somewhere in the Indian plains, you may not be very happy about the prospect of a very long hot day!!!

But for those optimistic astronomy buffs out there, this may be a chance wear a staw hat, some shades, sip on a mocktail and chill out under the sun!

Wishing you a very Happy but not so warm Summer Solistice 2K8

Clear Skies
Admin

Winstars 2.0

Winstars is a free planetarium software that sports pretty good graphics, say goodbye to old Skyglobe for now!

WinStars uses the latest 3D technology to show the objects of our solar system in a realistic manner. Thus, it is possible to move from one planet to another, to follow a space probe on its long voyage or to observe a celestial event from a place to which you could never go. The use of the Jet Propulsion Laboratory’s DE 404 planetary theories allows us to have a precise representation of the events displayed.

DOWNLOAD FROM winstars.com

AAAD Galleries are Active

Dear Bohemians!

The AAAD website now features a full Picture Gallery Support.

The gallery is located at

http://www.aaadelhi.org/gallery2

If you want to share your astrophotography exploits here just send a request to vidur_itm@yahoo.com

All experience levels are invited!

Clear Skies
Admin