Fans of Astronomy will miss him and his advice on what to look for in the night sky.
If the name does’t ring a bell, you probably didn’t catch much PBS in the Eighties and Nineties, especially late in the evening, usually after reruns of Doctor Who or the numerous Britcoms they’d show. I think after Lawrenece Welk too, when my grandparents had hijacked the TV. Jack usually appeared during the breaks or before a PBS station would sign off for the night. He’d cover which planets and constellations were visible that week plus some other trivia.
Jack was well-known enough to do a skit for the Cartoon Network too. I vaguely recall that plug. I think it involved the Powerpuff Girls.
Hopefully, the affiliate in Miami where he operated from will carry on with a new host, it’s what he would’ve wanted so we’d all “keep looking up!”