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Tag: timekeeping

Engines Podcast

Engines of Our Ingenuity 2038: Leap Second

Dr. John Lienhard

Posted on January 7, 2022 · Episode: 2038 Putting a leap second in an elastic year. Today, we add a second to our lives.

Tags birth of Christ calendars cesium clock Earth's rotation measurement standards tidal friction timekeeping US Naval Observatory

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Engines Podcast

Engines of Our Ingenuity 2252: Erwin S Ferry

Dr. John Lienhard

Posted on June 20, 2022 · Episode: 2252 Ervin S. Ferry and the persistence of illumination. Today, the persistence of light.

Tags automobile torpedo engineering Ervin S. Ferry Ferry-Porter Law of critical fusion Gyrodynamics Gyroscope gyroscopic control intrumentation laboratory measurement ophthalmology optics optometry persistence of sight Purdue University quantum mechanics Uppsala vision

Engines Podcast

Engines of Our Ingenuity 2203: The Chankillo Observatory

Dr. John Lienhard

Posted on March 28, 2022 · Episode: 2203 The Chankillo Observatory, first in the Western Hemisphere. Today, we learn the time of the year.

Tags anthropology calendars Chankillo Observatory fortified temple Incas Native American pre-Incan people solar observation summer winter solstices

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