The Apollo program... followed by the prior series of Mercury & Gemini flights. I remember - like it was literally yesterday, seeing Neil Armstrong & Buzz Aldrin taking off for the moon on TV. That was it for me. Anything "space" was thereafter within my zone of fascination.
My first real interest in astronomy, as such, was in staring at the moon through a rifle sight we had on a gun on our property to see where Apollo 11 landed. I swore I could find it......