- A solar eclipse is a rare and beautiful astronomic phenomenon as the orbiting moon blocks out the sun, making twilight out of a sunny day.
- Witnessing a total solar eclipse is a once-in-a-lifetime event, and a spectacle that millions of people think will be worth travelling for.
Permanent damage
- The retina contains the sensitive cells that turn light into electrical signals sent to our brain, allowing us to see.
- Your eyes aren’t burned, but the blue light can cause a chemical reaction that can permanently damage the retina.
- To look directly at a partial solar eclipse safely we need to block almost all the sun’s light.
This allows you to look at the bright sun — even without an eclipse — without pain or eye damage. These glasses are readily available at many retailers, and some are being donated by libraries and universities in Canada and the United States along the eclipse’s path. It is strongly recommended to only purchase glasses from certified vendors, such as those listed on this list from the American Astronomical Society.
Safe viewing practices
- A great way to prepare for the eclipse is to practice — look at the sun through the glasses before the eclipse.
- Small children should be supervised when viewing the eclipse.
- If the child is too young to follow the instructions above, then you should keep them inside to be perfectly safe.
Indirect watching
- If you don’t have certified glasses, there are indirect ways of looking at a partial solar eclipse.
- A pinhole camera allows the eclipsed sun’s disk to be projected onto a screen using only a cardboard box, a piece of aluminium foil and some tape.
- You can find out if you are within the path of the total eclipse using various online maps.
Eclipse magic
- Take off the glasses and look up to see this, and the sunrise visible all around you, for the few minutes of total eclipse magic.
- If the weather is good, crowds watching the eclipse may be large, so be patient and prepared for delays.
Robert Knobel does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.