Horology (from Greek: ὥρα, "hour, time" and Greek: λόγος, logos, "study, speech"; lit. the study of time) is the art or science of measuring time. Clocks, watches, clockwork, sundials, clepsydras, timers, time recorders and marine chronometers are all examples of instruments used to measure time.

People interested in horology are called horologists. That term is used both by people who deal professionally with timekeeping apparatus (watchmakers, clockmakers), as well as aficionados and scholars of horology. Horology and horologists have numerous organizations, both professional associations and more scholarly societies.

Horology has a long history^{[chronology citation needed]} and there are many museums and several specialized libraries devoted to the subject. An example is the Royal Greenwich Observatory, which is also the source of the Prime Meridian (longitude 0° 0' 0"), and the home of the first marine timekeepers accurate enough to determine longitude (made by John Harrison). Other horological museums in the London area include the Clockmakers' Museum, and the horological collections at the British Museum, the Science Museum (London) and at the Wallace Collection.

Travis Dickerson is an American musician and producer, best known for his work with Buckethead and Viggo Mortensen. He also runs TDRSmusic, a recording studio with its own record label that has recorded and released albums by Bill Laswell, Jethro Tull, Linda Ronstadt, and Vince DiCola. Dickerson can be heard playing keyboards on many albums he recorded or produced.

Travis Dickerson was raised in Michigan, where his father, Burton Dickerson, was an arts teacher at the Central Michigan University. When Travis was ten years old, his father exchanged a painting for an old piano and Travis got it to work again.

Together with his brothers he early made some musical experiments, first recordings and later moved to Los Angeles where he met the punk band X. In his new studio in Chatsworth a bunch of the band's releases as well as some solo projects were recorded. Singer Exene Cervenka introduced Dickerson to Viggo Mortensen, starting a long friendship. Nearly all of Mortensen's albums since then were recorded or distributed by TDRS.