catch venus's voyage across sun while you can - aluminized film
If you happen to take a look at the sun in the evening and notice a black spot moving over it, don't be afraid, it's not dust in your eyes, nor is it an early sign of glaucoma --it's Venus.
Track real-time feedback on VenusFind's online shipping.
View the amap for relative visibility of traffic around the world.
Find the local traffic time.
Our nearest planetary neighbor passed between the Earth and the sun before 6: 04. m. ET on June 5.
It is arranged together in a way visible to the naked eye.
The transit time is about six hours, but in most parts of Canada it takes only a few hours before sunset.
"The farther you go west, the better the view, but in fact, it's good for most parts of Canada," said Mike Reid, a lecturer in the Department of Astronomy at the University of Toronto and public outreach
Coordinator of the University Institute of Astronomy and Astrophysics.
To commemorate this year's Golden Star Day, the public can safely observe the golden star day and learn more about the golden star day.
At this considered Canada's largest gathering, more than 5,000 people gathered at the University of Toronto's University gymnasium to safely observe traffic using special sunglasses and telescopes issued by the Dunlap Institute.
The space camera is a robotic telescope that can transmit real-time images of space online.
Transit time for solar telescopes from Australia, Japan, New Zealand, Hawaii, Norway, Arizona and New Mexico.
Other sites, including San Francisco
The Discovery Museum and borderless are also broadcast live.
The Dunlap Institute has sorted out some locations for on-site feedback.
Users of Apple and Android smartphones can download the free Golden Star Day app created by astronomers, which does not have BordersandESRI, a company that works with geographic information systems or GIS technology
The app is available for the atiTunes App Store and android Market, allowing users to discover when and where to be visible during transit
Relevant tweets, download photos and videos, and learn about the history of shipping.
The Dunlap Institute has distributed another 43,000 pairs of "transit glasses" to universities and the Royal Astronomical Society of Canada chapters across the country, and similar glasses are being sold in Sky News Magazine and various websites.
For those who can't get the glasses, Reid suggests making a simple device like apinhole project torto that projects images of the sun onto the ground or on another surface. (
The San Francisco Discovery Museum Science Museum recommends using binoculars to prove this. )
Mark Anderson, author of "get to know morettor", discusses his book on the history of the Golden Star Transit, the day the world finds the sun, about quirks and quark.
Just like the ring-shaped yellow road that dazzled millions of people around the world in May 20, the key to watching the Golden Stars safely is to avoid looking directly at the sun without protecting the lens.
Sunglasses or regular telescope lenses are not enough to protect the eyes.
For safety reasons, the lens must be treated with aluminum-containing film like Mylar, or with a powerful filter like the type on some welder glasses.
The Royal Astronomical Society of Canada specifically lists a number of security lens options for transit on its website.
No matter which viewing method you choose, the key is not to miss your last chance to see Venus transit, Reid said.
"This will not happen again until 2117, so it's worth a try," Reid said . ".
The best location for transit is Central Pacific, but people in eastern Australia, New Zealand, Japan, the Philippines, South Korea, parts of China, Russia and the Pacific region, such as Papua New Guinea, will also be able to see the entire journey of Venus through the sun --
Although for them this will happen on the morning of June 6.
Europeans, as well as people in East Africa, the Middle East, India and the middle region, must get up early to see the crossing.
Parts of West Africa, Portugal and Latin America and Spain will be completely missed.
In order for people on Earth to be able to see Venus passing through the sun, the earth must pass through the Earth's orbital plane at the exact time the Earth, Venus and the sun line up.
This does not happen very often, because most of the time, when Venus passes through the plane of the Earth's orbit, the Earth is elsewhere in its orbit, so, there is no direct line of sight from Earth to Venus and the sun, and the Earth's orbit around the sun is slower than Venus.
"If they all run around the track on the same plane, just like runners run around the track, then there is a transit every time Venus" lands "Earth," Reid said . ".
However, the orbit of Venus is tilted relative to the orbit of the Earth, so the only way for Venus and Earth to align with the sun is, if Venus revolves around the Earth just as it passes through the plane of the Earth's orbit.
"This only happens at two points in the orbit of Venus (
The Venus orbit rings "penetrate" two points of the Earth orbit).
When Venus "falls" on Earth, the chances of it happening at one of these two points are small.
"When transit occurs, they occur in pairs, eight years apart from each transit, and then until 105. 5 or 121. 5 years later.
The last transit was in June 2004, and after this year's transit, the next transit will not take place until December 2117. (
Understand why the time of transit follows this pattern. )
"This is very similar to the reason why we don't see a solar eclipse every new moon," Reid said . ".
"You might think that it blocks the sun whenever the moon is between the Earth and the sun, but sometimes it's a little higher than the sun, and sometimes it's a little under the sun.
"Mercury will occasionally align with the Earth and the sun, more often than Venus, but the naked eye can't see its transit Because Mercury is much smaller than Venus and farther away from Earth.
This will be Venus's eighth transit since the invention of the telescope in 1609.
Our earliest transportation record is from 1639 kilometers (
Prior to this, the transport in 1631 was known in Europe but not visible).
A young amateur astronomers in Lancashire, England, recorded the 1639 transit of Vinus, whose name is Jeremiah horoks (
Spell Horrox sometimes)
And his friend, William cratley.
Horrocks uses his observations to measure the diameter of Venus and to obtain a rough estimate of the distance between the Earth and the sun.
Ling is in pairs. Why happens every 105 pairs of golden stars. 5 or 121. 5 years.
In later years, astronomers, most notably Edmund Harley, have improved the method of using transit to estimate the distance to the Sun by measuring the difference in transit time, this depends on the position of the observer on Earth and the principle of applying the displacement effect is called parallax
In the 18 th and 19 th centuries, many researchers were preoccupied with the precise measurement of distance, which was partly the motivation of Captain James Cook's first South Pacific expedition.
Cook's mission is to observe the 1769 transit days of the Royal Society of England and start doing so from Tahiti Island.
Today, the distance between the Earth and the sun, known as astronomical units, is well known and can be measured with radar, while lingri has begun to serve another purpose: they are helping astronomers locate planets outside the solar system, the outer planets.
When these planets pass between the Earth and the stars they orbit, they block some light from the star, causing it to darken slightly.
By observing the nature of this darkening, astronomers can learn about the planets that cause this darkening.
"You look for the same dark pattern, repeated over and over again, what kind of planet you can take from it, how far it is from the star, whether it is a big planet or a small planet, now, reid said: "We have reached the point where we can measure the composition of the Earth's atmosphere. ".