Published: Thursday, January 23, 2014, 12:01 a.m.
Like the 16th century sailing ships of Britain’s Royal Navy, the crew of the FHC’s Avro Lancaster found their way at night by using the stars. To properly operate a sextant, a navigator requires a 360-degree view of the sky. In a streamlined airplane, this vantage point was gained with the help of a bulging Perspex bubble, called an astrodome. In the days before GPS, both altitude and longitude could be determined, to an amazingly accurate degree, with the help of celestial navigation.