Mercury is showing a rare celestial show that rides the sun in front of most of the world's eyes. The smallest, innermost planet of the solar system will resemble a tiny black dot on Monday when it runs directly between Earth and Sun. It started at 7:35 pm EST.
The entire 5 ½-hour event will be visible in the eastern US and Canada as well as throughout Central and South America, depending on the weather. The rest of North America, Europe and Africa will be part of the action. Asia and Australia will miss it.
In contrast to hisMercury will almost hit the bull's eye this time and will practically pass the deadlock in front of our star. Mercury's next round will be in 2032, and North America will not have another opportunity to view it until 2049. Per century, Earthlings are treated with only 13 or 14 mercury passes.
As you can see
You needfor Monday spectacles: Telescopes or binoculars with sun filters are recommended. As with a solar eclipse, it is not safe to look directly into the sun without special goggles – not just normal sunglasses. It does not hurt to extract the from the total solar eclipse in the US two years ago, but it would take an "extraordinary vision" to detect tiny mercury, said NASA solar astrophysicist Alex Young.
During the Sun Transit 2012, Young's larger and closer Venus was barely discernible with his sunglasses. "That's almost the limit of what you can see," he said earlier this week. "So Mercury will probably be too small." Venus transits are much rarer. The next one is not until 2117.
Mercury has a diameter of 3,000 miles, compared to the 864,000 miles of the Sun. You can see a live stream of the Merkur Transit with expert comments from the following Slooh Community Observatory:
Mercury cuts a diagonal path from left to right over the sun on Monday and enters a lower left (around the 8-hour mark on a clock) and right above (around the 2-hour mark).
Although the hike seems slow, Mercury will race across the sun at about 241,000 km / h.  NASA will transmit the transit from the orbiting Solar Dynamics Observatory with only a short delay. Scientists will use transit to optimize telescopes, especially those in space that can not be tuned by hand.
With this transit scientists can discover foreign worlds. Regular, fleeting break-ins of starlight indicate a planet orbiting.
"Transits are a visible demonstration of planetary motion around the sun, and anyone with access to the right equipment should take a look," said Mike Cruise, president of the Royal Astronomical Society, in a statement England.