"Repeat" Performance
A few months back, I was intrigued to catch several episodes of “Cosmos,” an updated version of the classic 1980 Carl Sagan series. Along with the significantly expanded and enhanced visuals and (to me, anyway, generally annoying) animations, the series recounted the work, travails and accomplishments of Edmond Halley, who, even today, is probably best remembered for the comet whose 75-year cycle he identified and which still, as Halley’s Comet, bears his name. Halley wasn’t the first to see the comet, of course – in fact, it had been recorded by Chinese astronomers as far back as 240 BC, noted subsequently in Babylonian records, and perhaps most famously shortly before the 1066 invasion of England by William the Conqueror (who claimed the comet’s appearance foretold his success). Halley noted appearances by the comet in 1531, 1607 and 1682, and based on those prior observations – and the application of the work and mathematical formulas of his friend Isaac Newton – pred...