NASA’s Rules for Watching a Solar Eclipse Safely

Four safe ways to watch a solar eclipse without burning your eyes are already spelled out by NASA and other experts, and the rules are simple: use certified eye protection or indirect viewing only.

Quick Take

NASA says partial and annular eclipses are never safe to view directly without proper protection.
The only time naked-eye viewing is safe is during the brief total phase of a total solar eclipse.
Pinhole projection is a safe option when you do not have eclipse glasses.
Binoculars and telescopes need front-mounted solar filters or must be used for projection only.

Why Direct Viewing Is the Risk

NASA says the Sun must never be viewed directly during a partial or annular eclipse unless you are using safe solar viewing glasses or a handheld solar viewer. The National Eye Institute warns that direct sunlight can damage the retina and says solar filters must meet the ISO 12312-2 standard. The American Association of Pediatric Ophthalmology and Strabismus gives the same warning and says ordinary sunglasses are not safe.

That warning matters because eclipse season brings out bad habits fast. People may grab cheap glasses, trust a random video, or assume any dark lens will work. NASA says the only time the Sun can be viewed safely with the naked eye is during totality, and even then that exception applies only to the full total phase. For every other phase, the rule stays the same: no unprotected direct viewing.

Safe Method One: Certified Eclipse Glasses

The simplest safe choice is certified eclipse glasses or a safe handheld solar viewer. NASA says viewers should keep them on at all times during partial or annular eclipses. The National Eye Institute says those filters must meet ISO 12312-2, which is the standard used to mark approved solar filters. This is the method most families will use if they want to watch directly and safely.

That protection also applies to cameras, binoculars, and telescopes. NASA and the American Association of Pediatric Ophthalmology and Strabismus both say optical devices should not be used for direct viewing unless they have proper solar filters mounted in front. That detail matters because the Sun can overwhelm the eye fast, especially when an instrument concentrates light. Ordinary sunglasses, smoked glass, and makeshift filters are not enough.

Safe Method Two: Pinhole Projection

Pinhole projection is the easiest backup when you do not have eclipse glasses. NASA says you can punch a small hole in a card or make a simple box projector, then let the Sun shine through the hole onto a nearby surface. The Royal Astronomical Society and the Exploratorium give the same advice and stress one key rule: never look through the pinhole at the Sun.

Total Solar Eclipse On August 12: NASA-Approved Safety Tips For Safe Viewinghttps://t.co/spQ13FJqrr pic.twitter.com/ENul1Wv7t4

— NDTV (@ndtv) August 6, 2026

This method works because you are not looking at the Sun itself. You are watching a small projected image on paper, cardboard, or the inside of a box. The National Eye Institute says this indirect approach is safe and still exciting. It is also easy to explain to children, which makes it one of the best family-friendly options for an eclipse watch party.

Safe Method Three: Projection With Binoculars or a Telescope

Binoculars or a telescope can also be used safely, but only for projection or with proper front-mounted solar filters. NASA says a small telescope or pair of binoculars can project a magnified Sun onto a white card. The Royal Astronomical Society gives similar directions and says the viewer must avoid the urge to look through the instrument directly. That is a major point many people miss.

For most readers, the safest lesson is simple: do not improvise with optics. If the goal is direct viewing, use approved solar filters made for that purpose. If the goal is projection, aim the instrument at a screen and step back. The experts all point to the same common-sense rule. When any bright part of the Sun is visible, your eyes need protection or distance from the beam.

Why the Message Keeps Coming Back

The repeated warnings show how easy it is to get this wrong, especially when social media spreads shortcuts and junk advice. NASA, the National Eye Institute, the American Association of Pediatric Ophthalmology and Strabismus, the European Space Agency, the Royal Astronomical Society, and the Exploratorium all agree on the core safety message. They all support certified filters or indirect viewing, and they all reject naked-eye viewing during non-total phases.

That consistency is important for parents, teachers, and anyone planning a public viewing event. The safest plan is to buy certified glasses ahead of time, keep backup projection materials ready, and never trust a product that lacks clear certification. The totality exception also needs to be explained plainly so people do not confuse a full eclipse with the partial phases before and after it. Clear rules keep the day safe.