How to Watch a Flying Saucer - addressing what they are rather than what they might be.
The Moon and Tides
Birth and Death of Stars
The Equinox
Fall or autumnal equinox
Equinoxes are opposite on either side of the equator, so the autumnal (fall) equinox in the Northern Hemisphere is the spring (vernal) equinox in the Southern Hemisphere and vice versa.
No record of planetarium use or public shows 1976-1979