WHAT IS A TRANSIT OF VENUS? The planet Venus passes directly between the Sun and Earth Tiny Venus...
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Transcript of WHAT IS A TRANSIT OF VENUS? The planet Venus passes directly between the Sun and Earth Tiny Venus...
![Page 1: WHAT IS A TRANSIT OF VENUS? The planet Venus passes directly between the Sun and Earth Tiny Venus tracks across the face of our giant Sun Pairs of transits.](https://reader037.fdocuments.net/reader037/viewer/2022110208/56649da95503460f94a96a79/html5/thumbnails/1.jpg)
THE TRANSIT OF VENUS
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WHAT IS A TRANSIT OF VENUS?• The planet Venus passes directly between the Sun and Earth
• Tiny Venus tracks across the face of our giant Sun
• Pairs of transits occur every 105.5 years to 121.5 years
• Last transits of Venus:
• June 5, 2012
• June 8, 2004
• Next transits of Venus:
• Dec 10-11, 2117
• Dec 2125
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WHAT IT LOOKED LIKE
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HOW DOES A TRANSIT WORK?• http://www.youtube.com/watch?v=ehHY9fTrb7Q
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SOME HISTORY• 1627 - Johannes Kepler became the first person to predict a transit of Venus, by
predicting the 1631 event (not very accurately)
• 1639 – first scientific observation by Jeremiah Horrocks in England using a telescope projecting an image of the Sun onto a piece of paper
• 1761 and 1769 – scientists of the day proposed to use solar parallax to calculate the Astronomical Unit
• 1761 – scientists observed from: Siberia, Norway, Newfoundland, Madagascar & South Africa
• 1769 – scientists observed from: Hudson Bay, Baja California, Tahiti, Norway & from several locations in Russia
• 1874 & 1882 – scientists had accurately calculated the Astronomical Unit – 149.59 M kms
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POINT VENUS, TAHITI – JAMES COOK (1769)
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PLANNING FOR 2012
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WEATHER – TO TRAVEL…OR NOT• We were having the worst weather for years in early June
• Do I run or do I stay?
• Drive the motor home to Redding, CA
• Fly to Las Vegas
• Fly to Yellowknife
• Fly to Maui
• Forget it…I’m staying!
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EQUIPMENT – BINOCULARS & SOLAR FILTERS
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EQUIPMENT –SOLAR FILTER GLASSES
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EQUIPMENT – TELESCOPE & SOLAR FILTER
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PHOTOS – SOLAR FILTER & TELEPHOTO LENS
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PREPARATION FOR THE BIG DAY
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THE START – FIRST CONTACT – 3:09:38PM
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MID-POINT BETWEEN CONTACT I & II – 3:10:47PM
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SECOND CONTACT – 3:27:34PM
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MID POINT - GREATEST TRANSIT - 5:29:36PM
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THREE QUARTER POINT - 8:00PM
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LAST GLIMPSE OF VENUS TRANSITING THE SUN - 8:37PM
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LOST IN THE TREES & CLOUDS
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JUST ABOVE THE TREES
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TRACKING ACROSS THE SUN
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NASA’S SOLAR DYNAMIC OBSERVATORY• http://www.youtube.com/watch?v=4Z9rM8ChTjY
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WHAT’S NEXT?
• Transit of Mercury in May 2016
• Entire transit visible in eastern North America and Western Europe & Africa
• Partially visible in western North America, Africa, Middle East, Russia, parts of Asia
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TRANSIT OF MERCURY – NOV 8, 2006
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RESOURCES
• eclipse.gsfc.nasa.gov – click on Transit of Venus of 2012
• www.transitofvenus.org
• en.wikipedia.org/wiki/Transit_of_Venus
• www.nasa.gov/sdo - NASA’s Solar Dynamics Observatory
• victoria.rasc.ca – click on Astronomy Day for copies of today’s presentations