"Star Hustler" was frequently the last thing a station would show. I mean it. The last thing they would show before signing off. Yes, back in the day, stations would sign off at the end of the night.
I used to catch it after watching "Dr. Who" (Tom Baker, FTW!) or "Blake's 7". Later, in the 90s, they would show "Alive from Off Center" or an old horror movie, then sign off.
In 1970s, Jack Horkheimer was appearing on news programs talking about astronomy. He was approached by Florida's PBS affiliate, WPBT, to do a series of half-hour programs about astronomy. He agreed on the condition that WPBT help him create a series of 5-minute shows on stargazing. This was the beginning of "Jack Horkheimer: Star Hustler."
In May 1985, the show went national, being broadcast on PBS stations around the United States with the enthusiastic Horkheimer that most people are familiar with. He realized that he was playing a character in order to generate enthusiasm for the show
The show has many catchphrases that viewers associate with Jack Horkheimer. Horkheimer's appearances on the show are always marked with his opening line, "Greetings, greetings, fellow star gazers!" and his signature closing line, "Keep looking up!" These are the most widely recognizable quotes from the show but there were also others in common usage throughout the series.
With the rise of the Internet, however, search engines were giving results for the "Hustler" adult magazine instead of the program's web site showing up at the top of results. As a result, the producers renamed the show "Star Gazer" to avert any confusion, accidental or purposeful.
The theme, by the way, was Debussy's First Arabesque.