I think it would come down to three for me.
Halley's Comet - my first experience at a dark site and the first time I took a serious photo, on film
The first time I saw Saturn through a telescope.
Transit of Venus. I setup two telescopes in a vacant lot across the road from my place. During the course of the day, I had probably 15-18 people pull up and ask what I was doing. Everyone then asked if they could have a look. At one point I had a queue.
All wonderful experiences.
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