This Thursday (10) occurs an "annular eclipse" of the Salt, a phenomenon that for a few minutes produces a beautiful "ring of fire" in the sky, resulting from the partial concealment of the solar disk by Moon passing between us and our star. 

Unfortunately, the full range is quite small. The annular eclipse will only be seen from northern Canada to eastern Siberia, passing through Greenland and the Arctic Sea. Big cities in the northern hemisphere, like Chicago, New York, Toronto, Boston, Paris, London, Berlin, Stockholm and Moscow will only be able to observe a partial eclipse with the naked eye.

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But that doesn't mean that we Brazilians will be left out. We will be able to follow the eclipse through free online streams, just as we did with the lunar eclipse that followed the “blood supermoon".

Want to see how it went? In addition to the videos posted on this page, you can access our image curation posted on Twitter about the phenomenon.

How to view the "ring of fire" solar eclipse online

No one better than the US Space Agency, NASA, to show the world an eclipse. The broadcast starts at 6:00 am (GMT) on NASA TV on YouTube or in the video below.

However, the Sun will only be visible when it appears on the horizon, at 6:47 am, precisely the peak of the eclipse. This broadcast will show a partial eclipse, with 90% of the Sun covered, so we won't have the "ring of fire". But it will be a beautiful show anyway.

Another of the broadcasts is the Virtual Telescope Project, which will start at 6:30 am (GMT) on Thursday. The video can be seen on the project website, or also on your YouTube channel. To make it easier, we put the video below. Just "play" at the time of the eclipse and enjoy.

Finally, we have the transmission from the Time and Date website, which starts a little earlier: at 6:7 am (Brasilia time). The peak of the eclipse, when the “ring of fire” appears in the sky, should occur at 41:XNUMX am.

What is an annular eclipse of the sun?

An eclipse occurs when one star hides another. During a lunar eclipse, for example, the Earth is placed between the Sun and the Moon.partial eclipse) or all of it (total eclipse), “disappear” for a few minutes. This is an eclipse.

During a solar eclipse, roles are reversed. It is the Moon that lies between the Sun and Earth, hiding our star. But a peculiarity in the Lunar orbit generates a third type of eclipse, the annular.

The Moon's orbit around our planet is elliptical, and the distance between it and us varies over time. At the closest point, the Perigee, the Moon is 362.600 km from us. But at the farthest point, the Apogee, it is 405.400 km away.

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It's a difference of 42.800 km, which causes its apparent size in the sky to change. For example, a "supermoon” is a full moon that occurs during Perigee, making it look bigger than usual in the sky.

During the Apogee, the Moon seems smaller. And if a solar eclipse occurs at or near this moment, it is not "large" enough to cover the entire solar disk: a portion of our star remains visible behind it, producing the "ring of fire" in the sky. It is an annular eclipse of the Sun.

This Thursday's annular eclipse will be the last of its kind, and penultimate overall, this year. We will have a total eclipse on December 4th, but unfortunately it will only be visible in its entirety by those in the extreme south of the planet, including the Falkland Islands, in the Atlantic Ocean, and Antarctica.

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With the collaboration of Marcelo Zurita