This is one of the better episodes, tragic as it is. Of course it's not about the earth's orbit circling closer to the sun. (See "The Day The Earth Caught Fire" for a feature-length example of that scenario.) It's about the inevitability of death, which we all face, and about how we spend our last hours.
Lois Nettleton is the only boarder left in the apartment house, the others having left for places like Toronto, despite the choked highways. Nettleton is left alone with her landlady, dripping with sweat, Nettleton running around in only her slip, a nice artistic touch. The landlady, older and with a plain face, is actually pretty good. The role is sympathetic and the actress does a decent job. I believe she may have been Wanda Scutnik in "Call Northside 777" but I'm too lazy to look it up.
Nobody is "bad" in this story. There is a break-in by an ugly guy who swills down some water and shakes the rest over his coarse locks, but he turns out to be an ordinary man stricken with grief over the deaths of his wife and baby.
Mrs. Bronson, the landlady, mentions a waterfall near Ithaca, New York, in which she used to bathe as a child. It's a real site. It's Taughannock Falls, and Nettleton's painting of it is reasonably accurate. It's a pleasant place to visit. I lived in Ithaca for several years, and it's not surprising that the script, by Rod Serling, should mention it since he was raised in Binghamtom, not far away.
The story has a surprise ending which I won't reveal.