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Venus Transiting the Sun - Des Moines, IA | by w4nd3rl0st (InspiredinDesMoines)
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Venus Transiting the Sun - Des Moines, IA

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Do you belive in good or bad luck 'omens'? If so, here's one for you. This is a photograph of Venus transiting our sun. The transit event occurs in pairs a little more than a century apart. The last time it happened in our lifetimes was 2004, just before the Tsunami in Indonesia. It won't happen again for something like 105 1/2 years from now.

  

So why am I posting this image? For one, I think it's kind of interesting when things like this happen. But the real reason was because it took a lot of effort to learn how to safely take a picture of the sun with a digital SLR. There are a few excellent resources (below) that will help you if you want to take a picture of the sun in the future (like in 2017 when we have a full solar eclipse here in the midwest...) Best spot to view the eclipse in the world (Hopkinsville, Kentucky). Major cities like Des Moines, Chicago, Kansas City, etc will all be in the 90th percentile for "quality" of view.

  

The Story of the transit in ancient times

Since there are dozens of better images of this event than mine, I thought it would be interesting to share the story of the early astronomers who tried to witness this event. Some of them are quite tragic... The first person ever to record the phenomenon was a young astronomer called Jeremiah Horrocks in Much Hoole, England. In November 1639 he used a tiny telescope to view the event.

  

Horrocks died of unknown causes two years later at 22. Later, Edmond Halley (yeah, that guy 'Halley' of Halley Comet fame) took charge of documenting this phenomenon. In 1716, Halley called on nations to join forces and record the event from different positions around the world.

 

Halley figured out that the transit from different spots would give astronomers comparative figures to calculate the distance between the Earth and the Sun using trigonometry. This was the first time accurate data could be obtained for the event.

 

My favorite story happened a half-century later in 1761. French astronomer Guillaume Le Gentil went to India in answer to Halley’s call, but showed up late due to bad weather. He lived in India eight years until the next one in 1769, but missed that, too, because of poor weather. To add insult to injury, when he returned home Le Gentil found out that he had been declared "dead" by his wife who actually remarried and spent all of his money with her new husband... nice!

  

Whether you are superstitious or not, do not look at the sun with the naked eye.

Either use special solar viewing glasses (make sure they come with a CE safety mark) or use a telescope to safely project the image on to a screen.

  

More Information

Good thread on "welding glass" as a ND Filter

    

Excellent article about today's transit

    

NASA's live and extended coverage of the event

    

I shot this with a Canon 100-400L plus 2x teleconverter mounted on a 7d. It was all held in place with a Vanguard Tripod.

    

Quick point of scale... Venus is 23.7million miles away (at its closest point) and the Sun is about 150 million miles from earth on average. Venus is 0.9488 the size of Earth. These two figures give you an idea of how massive the sun is compared to Earth / Venus (and how far away everything is as well).

    

Set-up

I mounted the gear on a tripod and used gaffer's tape to attach a #14 shade welder's glass to the lens hood. If you do this - make sure you use the right welding glass. You also need to make sure absolutely no light can get in behind the welding glass. It will create relfections and distoritons.

    

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Taken on June 5, 2012