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.

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Presentation transcript:

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 years to years Last transits of Venus: June 5, 2012 June 8, 2004 Next transits of Venus: Dec 10-11, 2117 Dec 2125

WHAT IT LOOKED LIKE

HOW DOES A TRANSIT WORK?

SOME HISTORY 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 – M kms

POINT VENUS, TAHITI – JAMES COOK (1769)

PLANNING FOR 2012

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!

EQUIPMENT – BINOCULARS & SOLAR FILTERS

EQUIPMENT –SOLAR FILTER GLASSES

EQUIPMENT – TELESCOPE & SOLAR FILTER

PHOTOS – SOLAR FILTER & TELEPHOTO LENS

PREPARATION FOR THE BIG DAY

THE START – FIRST CONTACT – 3:09:38PM

MID-POINT BETWEEN CONTACT I & II – 3:10:47PM

SECOND CONTACT – 3:27:34PM

MID POINT - GREATEST TRANSIT - 5:29:36PM

THREE QUARTER POINT - 8:00PM

LAST GLIMPSE OF VENUS TRANSITING THE SUN - 8:37PM

LOST IN THE TREES & CLOUDS

JUST ABOVE THE TREES

TRACKING ACROSS THE SUN

NASA’S SOLAR DYNAMIC OBSERVATORY

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

TRANSIT OF MERCURY – NOV 8, 2006

RESOURCES eclipse.gsfc.nasa.gov – click on Transit of Venus of en.wikipedia.org/wiki/Transit_of_Venus - NASA’s Solar Dynamics Observatory victoria.rasc.ca – click on Astronomy Day for copies of today’s presentations