São Paulo - A rare solar minieclipse takes place next Monday (9). It will be caused by the planet Mercury, which will be positioned between the sun and Earth.
The phenomenon will be visible between 8:12 a.m. and 15h42, but be careful to observe it, because solar radiation can hurt, permanently, human vision in a few moments.
Due to distance and to its smaller size than that of the Earth, Mercury can be observed in a 158.4 times smaller than the sun. Thus, only 1 / 25,000 of the star of our galaxy is hidden - hence the name minieclipse.
Mercury transit happens about 13 times a century. The last was in 2006 and the next will be on November 11, 2019. But the Venus transit will happen before, in 2017.
"In the next hundred years the transits of Mercury occur between 7 and 12 May and 7 and November 15, the latter being much more frequent. The interval between two consecutive transits may vary from 3.5 to 13 years," writes Oscar Matsuura, researcher and retired professor from IAG / USP (Institute of Astronomy, Geophysics and Atmospheric Sciences), in an article in the Brazilian Society of History of Science site.
as noted
One of the safest ways to observe the passage of mercury across the sun is to use a telescope with suitable protective against solar radiation.
If you do not have these equipment at home, another solution is to observe the phenomenon designing it with binoculars on a screen, like a sheet of paper (without looking directly at the sun with binoculars, penalizing projecting the image on paper). Thus, you can see the small black dot crossing the solar disk.
The site of the Astronomical Observatory of Lisbon has an article detailing the safest forms of observation of solar phenomena, such as the transit of Mercury.
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