Read as much as you want on BostonGlobe.com, anywhere and anytime, for just 99¢.

Venus will make phenomenal transit across the face of the sun

Vincent Yu/File/Associated Press

The transit of Venus, which occurs when the planet passes between Earth and the sun, in 2004.

LOS ANGELES - It’s a spectacle that won’t repeat for another century - the sight of Venus slowly inching across the face of the sun.

So unless scientists discover the fountain of youth, none of us alive today will likely ever witness this celestial phenomenon again, dubbed a “transit of Venus.’’

Continue reading below

It’s so unique that museums and schools around the globe are hosting Venus viewing festivities - all for a chance to see our star sport a fleeting beauty mark. Even astronauts aboard the International Space Station plan to observe the event.

The drama unfolds Tuesday afternoon from the Western Hemisphere (Wednesday morning from the Eastern Hemisphere.)

Venus will appear as a small black dot gliding across the disk of the sun. As in a solar eclipse, do not stare directly at the sun; wear special protective glasses.

The entire transit, lasting 6 hours and 40 minutes, will be visible from the western Pacific, eastern Asia, and eastern Australia.

Skywatchers in the United States, Canada, Mexico, Central America, and the northern part of South America will see the beginning of the show before the sun sets. Europe, western and central Asia, eastern Africa, and western Australia will catch the tail end after sunrise. Those who don’t want to leave their homes can follow live webcasts by NASA and various observatories.

“Anything silhouetted on the sun looks interesting. Seeing Venus is extremely rare,’’ said astronomer Anthony Cook of the Griffith Observatory.

Perched on the south slope of Mount Hollywood in Los Angeles, the observatory is girding for heavy traffic Tuesday afternoon as throngs were expected to peer through telescopes with special filters set up on the lawn.

Skygazers who want the full experience are flocking to Hawaii, considered one of the prime viewing spots since the whole transit will be visible. From Waikiki Beach on Oahu to the summit of Mauna Kea on the Big Island, eclipse glasses will be given out so that people can safely see Venus crossing.

Loading comments...
Subscriber Log In

You have reached the limit of 5 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week
Marketing image of BostonGlobe.com
Marketing image of BostonGlobe.com