WORTH NOTING ON TV

FRIDAY

Horowitz in Moscow (PBS, 9-10:30 p.m.): The spellbinding cultural documentary is getting its first airing since a live CBS broadcast in 1986. It captures not only the late pianist's first Moscow performance after a self-imposed absence of 61 years, but also his rapturous reunion with the fatherland and the Russian public's emotional response. In this updated version, host Charles Kuralt visits Horowitz's Manhattan town house and speaks with his widow. Among many compelling moments, those close-ups of the

Horowitz face and finger work are unforgettable. SATURDAY

Brian Regan special (Showtime cable, 10-10:30 p.m.): The popular young comic delivers his stand-up routines in the reminiscent tradition typical of his peers, but he's also known as one of the cleanest acts in the business. Taped in the Comedy Warehouse at Disney World's Pleasure Island, "Something's Wrong With the Regan Boy" - his first solo TV show - takes viewers back to his days of Little League, spelling bees, and birthday parties. TUESDAY

Nova (PBS, 8-9 p.m.): You doubtless have to be up there to know how it feels to peer down at the earth from space, but this show may come as close as any to giving you some notion. "An Astronaut's View of the Earth" takes you on a shuttle mission and offers awesome shots of the planet from orbit - with music written and performed by David Byrne of the Talking Heads.

PBS shows are listed under their national 'feed dates,' but they are being aired during Pledge Week, when schedules vary sharply station to station and may sometimes require viewers to look for repeats.