- Antiquarian Horological Society
- Promotes the study of clocks and watches, and other 20th-century mechanisms. Provides historical information about the organization and details of its journal.
- British Horological Institute
- Formed in 1858 to promote horology, and provide education, standards and support to its members.
- The British Sundial Society
- Aims to educate the public on gnomonics and to catalogue and advise on the restoration of sundials in the British Isles and to research their history. Includes image galleries, journals and membership information.
- Horology Courses
- Details of horology courses held at Birmingham University.
- Lincs BHI
- News, events, activities and general information from the Lincolnshire Branch of the British Horological Institute.
- Royal Observatory Greenwich: Time Fact Files
- Includes features and articles about time, the prime meridian and the history of time measurement, plus photographs of the Royal Observatory's collection of time pieces. Also contains a time FAQ and article about one hundred years of British Summer Time.
- Sundials on the Internet
- Provides links to assorted sundial related sites, plus detailed, illustrated Sundial Trails around cities and counties in the UK.
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