May 24, 2004
J. Kelly Beatty, Executive Editor
617-864-7360 x143, kbeatty@SkyandTelescope.com
Alan MacRobert, Senior Editor
617-864-7360 x151, amacrobert@SkyandTelescope.com
|Note to Editors/Producers: This release is accompanied by high-quality illustrations and a broacast-quality animation; see details below.
To provide your viewers and readers with more background on the transit, please direct them to http://SkyandTelescope.com/transit.
On Tuesday, June 8th, the planet Venus will glide directly across the face of the Sun. No one alive today has seen Venus "transit" the Sun it last happened in 1882 and astronomers around the world are eagerly awaiting this rare event. Only one other transit of Venus will occur this century, eight years from now on June 6, 2012.
Think of a transit as a miniature eclipse of the Sun. During a total solar eclipse, the Moon completely blocks the Sun's disk for just a few minutes. But even though Venus is much larger than the Moon, it's also about 100 times farther away, so it can cover only a fraction of the solar disk. As Venus makes its long-awaited crossing, it will appear as a perfectly round black dot slowly moving across the Sun's face. The most interesting aspects of this 6-hour-long event will occur when Venus enters and exits the outer edge of the solar disk, each passage taking about 20 minutes to complete. For example, as it starts to leave the Sun the planet's silhouette may look pear-shaped, creating what's called the "black-drop effect."
For observers in eastern and central North America, the Sun rises on June 8th with the transit already well under way. The entire event will be visible from Europe, central/eastern Africa, the Middle East, and Asia (except the Far East). The table below lists representative North American cities for which the transit will be in progress at sunrise, grouped by time zone. Transit times for cities in Europe, Africa, the Middle East, and Asia are also available.
|Local Times for June 8th's Transit of Venus|
|Halifax, NS||5:29 a.m.||8:05 a.m.||8:25 a.m.||28°|
|Moncton, NB||5:28 a.m.||8:05 a.m.||8:25 a.m.||28°|
|Saint John’s, NL||5:06 a.m.||8:35 a.m.||8:55 a.m.||35°|
|San Juan, PR||6:47 a.m.||8:08 a.m.||8:28 a.m.||22°|
|Atlanta, GA||6:27 a.m.||7:06 a.m.||7:26 a.m.||10°|
|Boston, MA||5:08 a.m.||7:05 a.m.||7:25 a.m.||23°|
|Charlotte, NC||6:09 a.m.||7:06 a.m.||7:26 a.m.||14°|
|Columbus, OH||6:03 a.m.||7:05 a.m.||7:25 a.m.||13°|
|Detroit, MI||5:56 a.m.||7:05 a.m.||7:25 a.m.||14°|
|Miami, FL||6:29 a.m.||7:07 a.m.||7:27 a.m.||11°|
|Montreal, QC||5:06 a.m.||7:05 a.m.||7:25 a.m.||22°|
|New York, NY||5:25 a.m.||7:05 a.m.||7:25 a.m.||20°|
|Ottawa, ON||5:15 a.m.||7:05 a.m.||7:25 a.m.||20°|
|Pittsburgh, PA||5:50 a.m.||7:05 a.m.||7:25 a.m.||16°|
|Toronto, ON||5:36 a.m.||7:05 a.m.||7:25 a.m.||17°|
|Washington, DC||5:43 a.m.||7:06 a.m.||7:26 a.m.||18°|
|Chicago, IL||5:16 a.m.||6:05 a.m.||6:25 a.m.||11°|
|Dallas, TX||6:18 a.m.||||6:26 a.m.||1°|
|Little Rock, AR||5:56 a.m.||6:05 a.m.||6:25 a.m.||5°|
|Memphis, TN||5:46 a.m.||6:05 a.m.||6:26 a.m.||7°|
|Minneapolis, MN||5:27 a.m.||6:04 a.m.||6:24 a.m.||8°|
|Omaha, NE||5:51 a.m.||6:04 a.m.||6:25 a.m.||5°|
|New Orleans, LA||5:59 a.m.||6:06 a.m.||6:26 a.m.||5°|
|St. Louis, MO||5:36 a.m.||6:05 a.m.||6:25 a.m.||8°|
|Sioux Falls, SD||5:46 a.m.||6:04 a.m.||6:25 a.m.||5°|
|Winnipeg, MB||5:21 a.m.||6:03 a.m.||6:24 a.m.||8°|
|Edmonton, AB||5:07 a.m.||||5:23 a.m.||1°|
|Regina, SK||4:48 a.m.||5:03 a.m.||5:23 a.m.||4°|
Warning: The Sun is dangerous to look at directly without a safe solar filter. Staring at it can cause serious eye injury and even blindness.
Fortunately, there are many easy ways to watch the transit safely. If you have keen vision, Venus should appear just large enough to be barely visible as a tiny black dot as it crosses the Sun. But when looking at the Sun you must use a safe solar filter, such as a #13 or #14 welder's glass or special "eclipse glasses" designed for solar viewing. Filters that are not safe, though sometimes recommended in error, include smoked glass, stacked sunglasses, metallized candy wrappers, and compact discs. While these will darken the Sun, they may still transmit enough invisible infrared radiation to damage your eyes.
Binoculars or telescopes can be used to view the transit, even if they are not equipped with a safe solar filter. Do not look directly into the eyepiece or the telescope's finder, but instead place a white card behind the eyepiece and project the Sun's image onto it. (The small, dark-glass disks that screw into the eyepieces of some older scopes are not safe and should be discarded. The Sun's light and heat, concentrated by the telescope, may shatter them suddenly.)
A guide to June's transit of Venus and viewing the Sun safely appears in the May/June issue of Night Sky magazine, now available on newsstands. To obtain a PDF of this article via e-mail, media representatives should contact Marcy L. Dill (617-864-7360 x143; mdill@SkyandTelescope.com). More detailed articles, exploring the historical significance of transits and how to photograph them, appear in the February, May, and June issues of Sky & Telescope magazine.
For more tips on how to view the Sun safely, see "Safe Solar Observing".
Sky & Telescope is making the following six illustrations and an animation available to the news media. Permission is granted for one-time, nonexclusive use in print and broadcast media, as long as appropriate credits (as noted in each caption) are included. Web publication must include a link to SkyandTelescope.com.