In her new book, Chasing Venus, Andrea Wulf tells the extraordinary story of the first global scientific collaboration, set amid warring armies, hurricanes, scientific endeavors, and personal tragedy. On June 6, 1761 and June 3, 1769, the planet Venus passed between Earth and Sun – each time visible as a small black dot against the burning face of the Sun for six hours. Transits of Venus always arrive in pairs – eight years apart – but then it takes more than a century before they are seen again. In the 1760s the world’s scientific community was electrified because the transit would allow them for the first time to calculate the distance between the planets in our solar system. This would require triangulated data to be compiled from various exact points around the globe – all taken simultaneously during the short period of the actual Transit. Join us for an intriguing glimpse at the spirit of the Enlightenment and the collaborative race to measure the heavens. Chasing Venus will be published in May 2012 in conjunction of the Transit of Venus on June 5/6, 2012.  Andrea Wulf will speak on Wednesday, May 30, from 7 – 8:30 at the Weld Hill Research Building at the Arnold Arboretum.  Register at www.my.arboretum.harvard.edu.  Fee $10 sponsor organization member, $20 nonmember.  Offered by the Arnold Arboretum of Harvard University and the Massachusetts Historical Society.

The Harvard-Smithsonian Center for Astrophysics is holding a special Observatory Night for viewing the Venus transit. Learn more. In 2004 we were treated to a sunrise view of Venus crossing the disk of the sun. On June 5th, we will enjoy a sunset Venus transit. If you miss this one, you won’t get another chance to see it until 2117 – and that’s a very long time to wait. The Center for Astrophysics will hold a special rooftop viewing of the Venus transit beginning at 6:00 pm. The transit will be visible from 6:03 until the sun sets at 8:19. Viewing is weather-dependent so call 617-495-7461 to check for cancellation.