Solar eclipse 2021: How to make a pinhole box to view solar eclipse?
Solar eclipse 2021: Experts always suggest not watching an eclipse with naked eyes. There are other measures to watch an eclipse and one such way is to see it through a pinhole box.
A box pinhole projector is a safe way to view the solar eclipse.
A total solar eclipse happens when the Moon passes between the Earth and the sun.
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The Sun is around four hundred times larger than the Moon. It is also 400 times further away from the Moon.
-PTC News 
