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He picked the best textbooks he’d ever used and created a series of digital courses, spending about a year recording each course. In retirement, Chandler launched a business, Math Without Borders, aimed at teaching math and physics to homeschoolers. “I was born to be a teacher,” he said as he prepared to give a virtual presentation to the Denver Astronomical Society on the motion of the planets. Before he retired around 2012 and moved to Denver in 2018, Chandler, 73, spent 35 years teaching physics and math, mostly to high schoolers. “…Making the whole thing much easier and user friendly, and less likely to send kids out with their parents to find the stars and get frustrated because they can’t match what Orion is supposed to look like with the sky.”Ĭhandler estimates at least a million copies of “The Night Sky” have sold since, though he hasn’t been involved with the company since the 1990s, when he gave up rights to an ex-wife as part of a divorce settlement.Įven when Chandler was involved in the company, he still kept his day job. “David’s innovation was to make the planisphere two-sided,” said Alan MacRobert, senior editor at Sky & Telescope Magazine. Sky & Telescope also for years recommended Chandler’s planisphere as the best option for their readers. The magazine went on to put in an order for 10,000 of Chandler’s planispheres, enabling him to get the company off the ground.
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“He said, ‘Oh this is good, you got this right,’ and boom, everyone descended on my table,” Chandler said. This story is part of a project highlighting the many unique individuals across Colorado.ĭo you know someone we should know? Tell us about your neighbor, friend or family member who has a story Colorado should hear. Digital Replica Edition Home Page Close Menu