Probably the most important solar observing safety bit:
⚠️ Even if you’re in the path of totality you need to use eclipse glasses at all times the sun is visible even if it’s only the tiniest little sliver.
🚫 You can NEVER look at the sun without eclipse glasses.
👁️ Only during totality, and totality only (e.g. not at 99.9%) you can look without glasses because the Moon literally completely hides the sun so you’re only looking at the Moon then.
@thomasfuchs It maybe worth mentioning there are apps that use GPS to find your location to figure out and announce when you're in totality (and therefore when it's safe to look).
I used one for a prior eclipse and it was great. I wouldn't have known when it was safe otherwise.
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