Eastern US to see partial solar eclipse November 3

Oct 29, 2013 by Jay Pasachoff
Eastern US to see partial solar eclipse November 3

(Phys.org) —For people in the eastern United States, the sun will rise half covered by the moon on Sunday morning, November 3, and the partial eclipse will last about 3/4 of an hour. Jay Pasachoff, Field Memorial Professor of Astronomy at Williams College and chair of the International Astronomical Union's Working Group on Eclipses, advises that people able to see very low on the eastern horizon and having suitable filters in hand would enjoy the event.

A will sweep across Africa about two hours later on that Sunday, when it will be afternoon, six hours later, in west Africa. After starting in the Atlantic, the shadow of the moon will reach Gabon, where Pasachoff and colleagues will observe totality, with the support of a research grant from the Committee for Research and Exploration of the National Geographic Society.

The eclipse will then continue across Africa through the Congos until it passes through northern Uganda, and northern Kenya, ending in southern Ethiopia and Somalia. The path of totality, when the bright everyday surface of the sun is entirely covered by the moon, will cross the middle of Gabon. Totality, weather permitting, in the middle of Gabon will be about 1 minute long, compared with only about 10 seconds long in northern Kenya.

Only partial phases of the eclipse will be visible in the U.S., in southern Europe (Spain, lower Italy, and Greece) and throughout the rest of Gabon, and through almost all of Africa (except for the southernmost tip).

Since the Sun's everyday surface is too bright to look at safely, to safely look at the partial phases people will have to make a simple "pinhole camera" (merely a 3 mm or so hole in a piece of paper that is used to project the sun onto another piece of paper, and then you look at that second paper with the sun behind you) or else get special filters—almost a million times darker than ordinary sunglasses–made to be safe for observing the sun.

In the United States, the will be visible at sunrise, 6:30 a.m. on that day in the eastern standard timezone. (Earlier that morning, daylight saving time will end at 2 a.m.) The sun's diameter will be over 50 percent covered by the silhouette of the moon at sunrise in Boston and New York, and 47 percent covered in Washington, D.C., and Miami. By about 45 minutes later, when the eclipse is about 8 degrees high in the sky (about four fingers high at the end of your outstretched arm), only a tiny bit of the sun would be covered by the moon's silhouette. So viewers will really want to look between sunrise and about a half hour later, when the sun is only about two fingers high on the east-southeast horizon. And viewers will need a true horizon level with them, not encumbered by even low, distant buildings, hills, or mountains.

A Google map showing the eclipse path (available at the easy-to-remember website of http://www.eclipses.info) is at http://tinyurl.com/eclipse13map and you can zoom into it and click at any location to see your local circumstances.

During a partial eclipse, the remaining surface of the Sun is too bright to look at safely without a filter or a pinhole camera. Natural pinholes are made by the spaces between the leaves in a tree, so sometimes just looking at the ground under a tree will reveal crescent images on the ground.

The Sun is so bright that sunglasses are of no help in cutting its brightness down to a safe level. Even a DVD or CD, though its coating cuts the sunlight's brightness considerably, is not safe (and certainly not safe to look through the hole). Numbers 13 or 14 welder's glass is safe to look through. In any case, when using a filter, never look for more than a few seconds at a time. Only with a pinhole camera, when you look away from the Sun at its projection rather than at the Sun, can you stare at the image for as long as you like.

The fact that eclipses can be predicted so accurately, to within a second of time, is a triumph for science and can be an inspiration for students who observe the eclipse.

Prof. Jay Pasachoff of Williams College in Williamstown, Massachusetts, the Chair of the International Astronomical Union's Working Group on Eclipses, will be in Gabon with a team of students, colleagues, and tourists to observe the eclipse. In Gabon, he will work with Dr. Vojtech Rusin of the Astronomical Institute of Slovakia, Williams College student Allen Davis '14, Williams College alumna Zophia Edwards '05 (a graduate student at Boston University), Aris Voulgaris of Greece, Robert Lucas of Australia, and others attempting to study the solar corona. They will study their observations together with observations of the made from spacecraft from the NASA, the Royal Observatory of Belgium, and the European Space Agency. One goal is to improve scientists' knowledge of "space weather," how particles and light coming from the Sun interacts with the Earth's atmosphere and with earth-orbiting communication and other spacecraft. In Gabon, Pasachoff's group is advising and being assisted by the Gabon Space Agency and Nommo Astronomia, the Gabon Astronomy Society, especially through Dr. Patrice Okouma of the South African Astronomical Observatory.

Extensive maps of the eclipse are made by Michael Zeiler, www.eclipse-maps.com , and Fred Espenak, eclipse.gsfc.nasa.gov . Mr. Zeiler is accompanying the Pasachoff team in Gabon along with Polly White. Transformation of Espenak's data to a zoomable Google map has been made by Xavier Jubier of Paris, France.

Images of the , weather permitting, should be available at the web at http://slooh.com ; Michael Kentrianakis of the Williams College team is arranging for the transmission on site in Gabon and Gabon national television might also be transmitting images.

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