My teenage son doesn't wear a watch, preferring to find the time on his smartphone. (He could also use the device to get his horoscope and an interactive map of the night sky, if he so desired.) It made me wonder if an astrolabe maker from medieval Europe would have bemoaned the slow and steady decline of his trade as mechanical watches became more popular. Perhaps the astrolabe could serve as a lesson for modern watch companies. Timex, take note!
- Andrewes, William J.H. "A Chronicle of Timekeeping." Scientific American Special Collector's Edition: A Matter of Time. Spring 2012.
- Burnett-Stuart, George. "Astronomical Clocks of the Middle Ages: A Guided Tour." Almagest. (Apr. 17, 2012) http://www.almagest.co.uk/middle/astclk.htm
- Janus. "The Astrolabe: An instrument with a past and a future." (Apr. 17, 2012) http://www.astrolabes.org/index.htm
- Jespersen, James and Jane Fitz-Randolph. "From Sundials to Atomic Clocks: Understanding Time and Frequency." The National Institute of Standards and Technology. Monograph 155, 1999 Edition. (Apr. 17, 2012) http://tf.nist.gov/general/pdf/1796.pdf
- Rees, Martin. "Universe: The Definitive Visual Guide." Dorling Kindersley Limited. 2008.