From the publisher: "Longitude is the dramatic human story of an epic scientific quest, and of Harrison's forty-year obsession with building his perfect timekeeper." The reviews on this are terrific.

In Episode 155, Brent loved this untold story of the women who were employed as calculators by the male astronomers working at the Harvard Observatory in the mid-nineteenth century. They worked to interpret the displays captured on glass photographic plates, categorize the stars, and measure distances in space by starlight. The collection of half a million glass plates made up the “glass universe” of the Harvard Observatory, and these women became groundbreaking scientists in various fields.