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Venus Transit 2004

 
 
Reply Wed 2 Jun, 2004 01:41 pm
On June 8, 2004, Venus - the Earth's sister planet - passes in front of the Sun as seen from the Earth.

This very rare event (no living person has ever seen one!) lasts about 6 hours and will be visible from most of Europe, Africa and Asia. It will most certainly generate unprecedented attention from the media and the public, not just in these areas, but all over the world.

This website describes the VT-2004 project that is related to this celestial event and which aims at transforming curiosity into knowledge and interest in science through a broad set of actions.
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Type: Discussion • Score: 1 • Views: 1,078 • Replies: 17
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Dartagnan
 
  1  
Reply Wed 2 Jun, 2004 03:50 pm
This will be cool, though I gather there will be no way to see it in these parts. In Thomas Pynchon's most recent novel, he portrays Mason and Dixon first working together during a voyage to map the Transit of Venus. They later went on, of course, to travel to America to plot the Mason-Dixon line. A great story...
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NickFun
 
  1  
Reply Wed 2 Jun, 2004 06:00 pm
I'm sure it will be cool but for some reason this kind of thing just doesn't fasciate me. It will be barely visible to those countries as the planet in relation to the sun will still be very small. And if you try to watch it you will burn your eyes out!
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Walter Hinteler
 
  1  
Reply Mon 7 Jun, 2004 02:25 am
An overview about all and everything, including pics (and perhaps live webcams) is to be found HERE
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dlowan
 
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Reply Mon 7 Jun, 2004 03:49 am
Here's a site and info from Stoat:

http://www.nasa.gov/vision/universe/watchtheskies/venus_transit.html


Venus Transit:
The Incredibly Rare Event is Visible in your Backyard or Live on the Web
05.14.04

"There will be no other till the twenty-first century of our era has dawned upon the Earth and the June flowers are blooming in 2004. What will be the state of science ? God only knows." - William Harkness, U.S. Naval Observatory 1882


An animated preview of the June 8 event. The last pair of transits occured in 1874 and 1882. High resolution stills Credit: NASA

NASA invites you to view a rare celestial event, one not seen by any person now alive. On June 8, the planet Venus will appear to cross in front of the Sun as seen from Earth. The last "Venus transit" occurred more than a century ago, in 1882, and was used to compute the distance from the Earth to the Sun. Scientists with NASA's Kepler mission hope to discover Earth-like planets outside our solar system by searching for transits of other stars by planets that might be orbiting them.

There are two ways to watch the transit: live or on the Internet. NASA has a partnership with observatories and museums to help people observe the event safely. You must take special precautions to safely observe the Sun directly. More information, including local events and viewing times, is available.


Scientists got a preview last May when Mercury transitted the Sun. Mercury transits occur about 13 times per century and this one was imaged by the TRACE spacecraft. TRACE will also view the Venus transit, but Venus will appear about 30 times larger. Credit: NASA/LMSAL

You can also observe the event by viewing it indirectly over the internet, with a live webcast from Athens, Greece thanks to a partnership between NASA and the Exploratorium.

The Venus transit will be visible over about 75 percent of the Earth, and will be nearing its end at sunrise over central and eastern North America. The event will be finished by the time the Sun rises over the West Coast of North America (but viewers in Alaska can see the beginning of the transit and, for Northern Alaskans, the entire transit, because the Sun does not go below the horizon). A map of the transit visibility is available for download. Transit times are also broken down by cities.

"People using a filter approved for safe solar viewing can expect to see a small black dot, about 1/30 the size of the solar disk, very slowly moving across the Sun," said Fred Espenak, an eclipse expert at NASA's Goddard Space Flight Center, Greenbelt, Md.

If people miss the June 8 Venus transit, they will have another chance in 2012 (June 6). After that, there will not be another Venus transit until 2117 (December 11).


This view of the Mercury Transit is from the SOHO spacecraft. Due to its halo orbit, SOHO will be unable to observe the Venus Transit. Rather, Venus will travel below the Sun according to its perspective. Credit: NASA/ESA

During the 19th century, Venus transits were essential for astronomers to fathom the scale of the heavens, because they were used to give a relatively accurate distance from the Earth to the Sun. Once that distance was known accurately, astronomers could determine the size of our solar system, and calculate the distances to nearby stars by measuring how much they appeared to shift against remote background stars as the Earth progressed in its orbit around the Sun.


Russian and American missions have been sent to Venus since 1962. The planet is similar to Earth in size, mass, and composition, but its carbon dioxide atmosphere makes it hot enough to melt lead. More on Venus Credit: NASA

So critical was this measurement that, beginning in 1761, leading nations sent expeditions to remote corners of the globe to time exactly when Venus appeared to begin its transit of the Sun. The precise timing of the transit depended on location because different places on the globe saw the event from different angles. The times were compared and the distance to the Sun calculated using the known distances between expedition locations on the Earth and trigonometry. Educators and students may do the calculations by following an activity on the website or on the half-hour NASA Connect TV program.

The transit phenomenon has relevance to the future of astronomy as well. There is evidence for more than 100 extrasolar planets (planets outside our solar system) around other nearby stars. However, current techniques can only detect large planets, gas giants like Jupiter. But a star might have a planet that appears to pass in front of it by chance alignment with the Earth, and planets similar in size to the Earth could be detected if they transit their parent star.

NASA's Kepler mission, scheduled for launch in October 2007, will allow astronomers to find smaller, presumably terrestrial extrasolar planets by looking for tiny dips in the brightness of a star when a planet crosses in front of it. Periodic brightness dips will signal the presence of a planet in orbit around the star, even if the planet itself is not directly visible. Kepler will observe about 100,000 stars in a patch of sky in the direction of the constellation Cygnus for four years, making brightness measurements every 15 minutes, in hopes of catching elusive transits. The Kepler mission is expected to detect 50 to 60 extrasolar planets with a similar distance from their parent stars as the Earth is from the Sun.

Additional Links:

Sun-Earth Connection Venus Transit Details
Exploratorium Transit Page & Webcast
Transit Predictions & Maps
Kepler Mission
European Southern Observatory
High Resolution Images
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Walter Hinteler
 
  1  
Reply Mon 7 Jun, 2004 11:14 am
The BBC has a couple of links and tipps, too, including a link for livestream observation.
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Walter Hinteler
 
  1  
Reply Mon 7 Jun, 2004 11:05 pm
It's to be seen now ... in some minutes.

(Obviously, this isn't of great interest, although the last time it happened was 122 years ago.)
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satt fs
 
  1  
Reply Tue 8 Jun, 2004 02:35 am
Currently (0835 GMT+0000, 4:35 EDT) it is progressing.
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dlowan
 
  1  
Reply Tue 8 Jun, 2004 03:01 am
has a big connection with Oz history.

Captain Cook was in the area - went to Tahiti - to observe the thing in 1776 - and then went on to "find" Australia - and, in the manner of the time, claim the new land for Britain.
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dlowan
 
  1  
Reply Tue 8 Jun, 2004 03:10 am
From Perth, Australia:

http://astronomy.swin.edu.au/~pbourke/venus/2s.jpg

http://astronomy.swin.edu.au/~pbourke/venus/4s.jpg

http://astronomy.swin.edu.au/~pbourke/venus/6s.jpg

http://astronomy.swin.edu.au/~pbourke/venus/7s.jpg

And then: : (

http://astronomy.swin.edu.au/~pbourke/venus/8s.jpg
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jespah
 
  1  
Reply Tue 8 Jun, 2004 06:29 am
Unfortunately, it was too cloudy here.
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dlowan
 
  1  
Reply Tue 8 Jun, 2004 06:37 am
http://www.abc.net.au/reslib/200406/r22773_56020.jpg
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dlowan
 
  1  
Reply Tue 8 Jun, 2004 06:39 am
http://www.abc.net.au/reslib/200406/r22629_55645.jpg
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jespah
 
  1  
Reply Tue 8 Jun, 2004 07:04 am
Ooh, thank you.
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NickFun
 
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Reply Tue 8 Jun, 2004 07:51 am
Oh lookie! A tiny spec moves in front of the Sun! What's the big deal???
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Walter Hinteler
 
  1  
Reply Tue 8 Jun, 2004 08:07 am
dlowan wrote:
has a big connection with Oz history.

Captain Cook was in the area - went to Tahiti - to observe the thing in 1776 - and then went on to "find" Australia - and, in the manner of the time, claim the new land for Britain.


Cook really HAD to look at the Venus in front of the sun - if he (and others) failed in 1769, every astronomer on Earth would be dead before the next opportunity in 1874.





NickFun wrote:
Oh lookie! A tiny spec moves in front of the Sun! What's the big deal???


That's why:

Transits of Venus are rare. They come in pairs, 8 years apart, separated by approximately 120 years. Halley (who first discovered this) himself could never to see one.

In "telescopic times", this happened in 1631, 1639, 1761, 1769, 1874 and 1882. So, the next will be in 2012 and the one after that will be in 2117 - there is no-one alive, who ever saw this: a big deal, inded.
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NickFun
 
  1  
Reply Tue 8 Jun, 2004 08:50 am
Granted, it doesn't happen very often. A couple of years ago I saw a brilliant comet that will only pass Earth every thousand years or so. I find that a much more exciting celestial event.
0 Replies
 
thehamster
 
  1  
Reply Tue 8 Jun, 2004 09:12 am
I seond your opinion NickFun.
The solar eclipse which happened some years ago was pretty fascinating and cool to watch...but what about that freakin spot on the sun??
It's like takin pen, drawing a black spot on the wall, and watching it for a couple of hours...
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