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“Halley’s Comet, a Viewer’s Guide.” Four Point Entertainment. $39.95. Cometmania is building. In the next few months a lot of people will be scanning the skies for Halley’s Comet and this handy introduction explains why. In the 50-minute cassette, three experts and host William Shatner dispense a steady stream of fascinating information--in layman’s terms rather than scientific lingo--about comet-watching, explaining how and when to look for this phenomenon, which appears every 76 years. Though more talking heads than impressive visuals, this cassette easily holds your interest. 1/2