Solar Eclipses

2024 Total Solar Eclipse

Exploratorium/ASP -


General eclipse pages

Eclipse Safety

See and Look through green Shade 14 welder's glass, or through special eclipse glasses ("CE certified") sold by a reputable vendor such as Rainbow Symphony; see for an extensive list of options. The filter *must* block 99.999% of the Sun's visible light and 100% of the Sun's ultraviolet and infrared light, or your eyes could be very seriously damaged (even blindness is possible). Enclosing welder's glass or eclipse glasses in "goggles" can create a MUCH more pleasant and enjoyable viewing experience. Regular sunglasses (even polarized ones) are NOT suitable at all, and neither is smoked glass or an exposed/developed film negative. If you use binoculars or a telescope, a proper filter *must* be placed at the front end of the device (closest to the Sun). Please be VERY careful when observing the Sun!

You can also use the pinhole camera technique, which is much safer: punch a hole (roughly the width of a pencil is a reasonable size) in a sheet of cardboard and look at the image of the Sun projected onto a shaded region below the cardboard. If you use a colander or other object having lots of holes (such as a straw hat), you'll get many images of the partially eclipsed Sun. Holes between the leaves of a tree can act like pinhole cameras and produce many Sun images on the ground.


Info from Andy Fraknoi about materials and guides produced with the grant from the Moore Foundation (that funds 10,000 public libraries around the country to provide 5 million free eclipse glasses, plus information, for the two upcoming eclipses):