Horometer

A horometer is a generic term for any time-measuring instrument or clock. While often used interchangeably with "clock" or "timepiece," "horometer" typically emphasizes the device's function as a precise measurement tool of time, rather than a decorative object or simple time indicator. The term is derived from the Greek words "hora" (hour) and "metron" (measure).

The term historically encompasses a wide variety of timekeeping devices, from simple sundials and water clocks (clepsydra) to complex mechanical clocks and modern electronic timekeeping instruments. Its use can imply a concern with accuracy and precision in time measurement. In some contexts, particularly in scientific or nautical applications, "horometer" might be preferred to underscore the device's role in determining longitude or conducting astronomical observations. Modern usage of the term is relatively uncommon outside of historical or technical contexts, with more specific terms like "chronometer" generally preferred when discussing high-precision timekeepers. A key differentiating factor between a horometer and a chronometer is that a chronometer is explicitly designed for navigation and exhibits high accuracy, whereas a horometer is a more general term for any time-measuring device.