- A History of Time: Classical Time
 - Conceptualization of time across the ages and inventors. - AResearchGuide.com: Measuring Time
- Links for research on ancient and modern methods of measuring time.
- Astral Clock in Ardekan, The
- Describes the operation and structure of Ardakaan's astral clock which is considered a vestige of the Yazdgirdian calendar.
- Clocks and Time: The alt.horology Newsgroup
- Description of the Usenet newsgroup that is interested in all aspects of horology.
- History of Clocks, The
- Sundials, water, pendulum, and quartz clocks to measure time.
- History of Time, The
- Brief note on the concept of time.
- LeapSecond.com
- Dedicated to precise time and frequency - one man's quest for the most accurate clock.
- Time and History of its Measurement
- About clepsydras, sundials, and more.
- Visualizing Video Streams Using Sand Glass Metaphor
- Ancient and modern methods like water, candle, incense, and sand clocks for visualizing spatio-temporal relationships.
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