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Transit of Venus: Solar glasses are a hot commodity

June 3, 2012 |  7:22 pm

Want to watch a once-in-a-lifetime astronomical delight this week? Buy your solar glasses soon.

In Los Angeles, the city-run Griffith Observatory is one of the few known places that is selling equipment for people to view the Transit of Venus directly. Solar glasses are on sale at the Griffith Observatory gift shop for $2.99 -- but the gift shop is only open until 9 p.m. Sunday, and the observatory will be closed Monday. The next chance to buy the glasses at the Observatory will be Tuesday after 12 p.m., just three hours before Venus travels across the Sun.

Transit-of-venus-graphicThe Transit of Venus is a rare astronomical event, where Venus will cross in front of the sun from the Earth's perspective, producing a small, visible dot that will glide from left to right across the top of the solar disk. The next time people anywhere on Earth will be able to see such an event will be in 105 years.

The event will begin shortly after 3 p.m. Pacific Daylight Time, but the sun in California will set before Venus completes its journey across the sun.

You can also try to find so-called No. 14 welder's glasses that might be on sale at welder's shops or at home improvement stores. You can also catch a NASA broadcast of the transit, or head to the Observatory on Tuesday afternoon to watch it through a telescope with a special solar filter.

You could try using a pair of binoculars, preferably with a magnification power above 7, to project the sun's light onto the sidewalk or a piece of paper. If you're able to find an image of the sun, look for a tiny dot showing the image of Venus.

But pinhole projectors used during the eclipse probably won't work this time, experts say, because they don't have enough resolution to show the planet's shadow.

The Transit of Venus has happened only seven times since the telescope was invented, according to NASA's Fred Espenak.

The last time was in 2004, but the Western United States was unable to view it. The most recent time Los Angeles has seen a Transit of Venus was in 1882, L.A.'s Griffith Observatory said.

According to an online video from Slooh Space Camera, astronomers used the Transit of Venus to calculate the size of the solar system.

Knowing it was so rare, countries sent out ships around the world "to time, to the second, how long it took the disk of Venus to move from one edge of the sun to the other," the video said. It was from this data that scientists were able to calculate the distance of the Earth to the sun, according to the video.

Those with the best seats for Venus' transit will be in eastern Australia, New Zealand and eastern Asia, weather permitting. For those west of the International Date Line, the eclipse occurs on Wednesday.

Transit-of-venusThe continental United States and southern Canada will get a partial show on Tuesday evening. The same show will also be visible in Mexico, Central America and the northern edge of South America, according to astronomer Jay Anderson.

Meanwhile, most of Europe, eastern Africa, and the rest of Asia will see the tail end of Venus' transit after the sun rises on Wednesday.

In terms of climate and location, eastern Australia or Hawaii are prime spots to watch this transit. In the continental U.S., the Southwest is your best option.

Able to photograph the transit? Tweet it to us at @LANow and tag it with #LAVenus. You can upload photos to our website.

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— Rong-Gong Lin II

Graphic courtesy of Griffith Observatory. Photo: The planet Venus (a small dot at the bottom of the image) passes in front of the sun in 2004 in this photo taken through the National Planetarium telescope in Kuala Lumpur, Malaysia. The last time it occurred was in 1882. The next crossing will be in June 2012, but the one after that will be in 2117. Credit: Ahmad Yusni / EPA

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