Can you see a round solar eclipse through a square hole?

If you live in the US and missed seeing the last total solar eclipse in 2017, there’s good news! You are going to get another chance. On April 8, there will be a total solar eclipse passing through Texas and the Midwest states. Remember that during a solar eclipse the Moon’s shadow falls on the Earth. If you are in this shade, it will look really weird. But also amazing.

Even if you’re not on the path of totality, you can still see something. All continental states will get at least a partial eclipse. (See map here NASA eclipse page.) And do I need to tell you this? Never look at the Sun without special glasses, even if it is mostly blocked by the Moon. You may still be able to get some safe solar viewer Before the big event.

But there’s another way to view the solar eclipse without glasses: using a pinhole projector. It is very easy to make and also easy to use. All you need is something flat like a piece of cardboard. Then you make a hole in it with a pin. that’s pretty much it. When sunlight passes through the hole, it will project an image onto a flat surface (such as a sidewalk).

If you did this on a normal day you would see a circular point of light. You might think this is because the hole is round. But during an eclipse you will see a crescent shape formed by the Moon passing in front of the Sun. It is both wonderful and safe for your eyes.

Actually, you don’t even need it Make A pinhole viewer – they’re already all around us. If you are standing under a tree, the small spaces between the leaves will act as pinholes to produce a cluster of tiny crescent-shaped images. Here’s a photo I took during the 2017 eclipse:

Images of the solar eclipse are projected through gaps in the upper leaves.

Courtesy of Rat Allen

fun with pinhole

Just for fun, here’s a question for you. Most pinholes are round (because pins have cylindrical shafts). But what if you replaced the round hole with a square hole? What shape will the round Sun appear on the ground? Will it be a circle? Will it be a square? or maybe it will be a dizzy, What about the triangular hole? What will happen then?

i actually have one card punch (Polarimeter to Unite the Corona and Heliosphere) which displays it with three apertures—circular, triangular, and square. Check it out.

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