Please note: These papers were prepared for the Greek Science course taught at Tufts University by Prof. Gregory Crane in the spring of 1995. The Perseus Project does not and has not edited these student papers. We assume no responsibility over the content of these papers: we present them as is as a part of the course, not as documents in the Perseus Digital Library. We do not have contact information for the authors. Please keep that in mind while reading these papers. A Brief History of Time ...

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Ancient Calendars Early Clocks A Revolution in Timekeeping The "Atomic" Age World Time Scales and Time Zones NIST Time Services Bibliography Ancient Calendars Celestial bodies — the Sun, Moon, planets, and stars — have provided us a reference for measuring the passage of time throughout our existence. Ancient civilizations relied upon the apparent motion of these bodies through the sky to determine seasons, months, and years. We know little about the details of timek ...

CalendarsCalendrical Systems Calendar The ancient Egyptians began numbering their years when the star Sirius rose at the same place as the Sun. The Egyptian calendar was the first solar calendar and contained 365 days. These were divided into 12 30-day months and five days of festival (Neugebauer 1969). From astronomical calculations, Sirius and the Sun coincided in 4241 and 2773 BC, so either of these could have served as Egyptian Year 1 ...

This information is reprinted from the Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann, editor, with permission from University Science Books, Sausalito, CA 94965. Another place on the WWW to look for calendar information is Calendar Zone. Calendars by L. E. Doggett 1. Introduction A calendar is a system of organizing units of time for the purpose of reckoning time over extended periods. By convention, the day is the smallest calendrical unit of time; the m ...

"A brief history of clocks" 'CLOCK GRID' Ancient Calendars Clocks Sun Clocks Water Clocks Europe & Clocks Mechanical Clocks Quartz Clocks Atomic Clocks Time Out BACK 2 MYSTICAL TIME GRID Our thanks to National Institute of Standards and Technology for the information http://physics.nist.gov/time This page was brought to you by Mystical World Wide Web "http://www.mystical-www.co.uk" Ancient Calend ...

"A brief history of clocks" 'CLOCK GRID' Ancient Calendars Clocks Sun Clocks Water Clocks Europe & Clocks Mechanical Clocks Quartz Clocks Atomic Clocks Time Out BACK 2 MYSTICAL TIME GRID Our thanks to National Institute of Standards and Technology for the information http://physics.nist.gov/time This page was brought to you by Mystical World Wide Web "http://www.mystical-www.co.uk" Ancient Calend ...