It might be hard for younger people to understand why this is such an enjoyable episode, but in 1985, Halley's Comet had arrived. It captured the imagination of a whole generation of elementary school and high school students, and a good many of us loved this episode of Tales from the Darkside because it focused on the comet.
Fritz Weaver was also a joy to see in this episode. The guy screaming "Obsolete!" in Twilight Zone episodes showing up as Edmund Halley was also a really awesome thing for aging baby boomers and their kids.
I admit that this episode is an acquired taste, and there may be zero chance of younger viewers getting it, but if you lived through 1985, this is a fascinating episode. Halley's Comet was kind of like a viral internet sensation just in the pre-internet era. Anything about it brings back fond memories for people who got to see it in 1985.