Calendars and Timekeeping Astronomy Science.
A calendar is a system of organizing days for social, religious, commercial or administrative purposes. (wikipedia)
- Published Calendrical Calculations www
Published by Cambridge University Press. Calculations. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil calendars. Calendrical Calculations.
- The Maya Calendar 2000 www
The calendar was the center of Maya life and their greatest cultural achievement. Calendar 2000. To carry out their astronomical calculations they developed a sophisticated mathematical system. The Maya Calendar website is developing with the intent of providing a complete view of Maya culture. Maya Calendar 2000.
- The The Islamic Calendar www
The mathematics of the calendar in Singapore. The Islamic Calendar.
- Complete GMT: Greenwich Mean Time www
Complete guide to times in every time zone in the world. GMT: Greenwich Mean Time.
- A Indian Moons www
A list of many American Indian tribe's names for months, Moons, days, and other calendar related information. Indian Moons.
- The The Chinese Calendar www
The mathematics and rule explanation for the calendar. The Chinese Calendar.
- A PlexGlobe: International Clock and Global Kit www
A productivity toolkit for global users and businesses that includes world clock and calendar. PlexGlobe: International Clock and Global Kit.
- A Annus Novus Decimal Calendar www
A proposal for a non-sectarian, Novus Decimal Calendar, culturally neutral calendar system. Annus Novus Decimal Calendar.
- Civil Leap Seconds www
Civil time is occasionally adjusted by one second increments. Seconds. A detailed explanation of what a second actually is, and why leap seconds are necessary. Leap Seconds.
- Explains Hindu Calendar Dates 52nd Century www
Explains the cosmological and astronomical influences in creating the Indian calendar. Hindu Calendar Dates 52nd Century.
- Second Blue Moon Myths www
Second full moon in a month, Moon Myths, or third full moon in a single season. Blue Moon Myths.
- Extensive Astronomical Time Keeping www
Extensive descriptions of many timing systems, Time Keeping, with information on time zones and Julian day numbers. Astronomical Time Keeping.
- Lunar Lunisolar Calendar www
Lunar calendar with lunations, Calendar, from new moon to new moon, instead of months. Moon phase on each day. Chinese, Jewish, and Islamic months. Eclipses, meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, and Jewish holidays. Lunisolar Calendar.
- An Julian Day Numbers www
An explanation of the Julian day number system used by astronomers and calendricists. Julian Day Numbers.
- History Calendars through the Ages www
History and FAQs of calendars, through the Ages, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan. Calendars through the Ages.
- An Types of Calendars www
An explanation of lunar, Calendars, solar, lunisolar, rule-based and other calendars. Types of Calendars.
- An The Calendar, Leap Years and the Year 2000 www
An explanation of the calendar including the origin of the day, Calendar, Leap Years and the Year 2000, week, month and year. The Calendar, Leap Years and the Year 2000.
- Britannica.com Britannica.com - Clockworks: From Sundials to the Atomic Second www
Britannica. Clockworks: From Sundials to the Atomic Second.com explores the history of timekeeping, from sundials to cesium atomic clocks. Britannica.com - Clockworks: From Sundials to the Atomic Second.
- The ACalendar.com www
The calendar has many options with a standard monthly interface, ACalendar.com, including sunrise, sunset, and Moon phases. ACalendar.com.
- Information Time and Date www
Information such as yearly and monthly calendars, and Date, counters, countdown, and the world clock which shows the current time in cities all over the world. Time and Date.
- The Calendopaedia www
The encyclopaedia of calendars. Calendopaedia.
- Explains Millennium Mistake www
Explains the difference between millennium and year 2000 as the absence of a year zero. Millennium Mistake.
- Explanations The Julian and Gregorian Calendars www
Explanations of the Julian Calendar, Julian and Gregorian Calendars, the Gregorian Reform, the adoption of the Gregorian Calendar, the length of the tropical year and related matters. The Julian and Gregorian Calendars.
- The Astro Portal - CalSKY www
The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, Portal - CalSKY, as well as astronomers. Astro Portal - CalSKY.
- Articles Calendar Studies www
Articles on the Gregorian and Julian calendars, Studies, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion. Calendar Studies.
- Features Astronomy and Space Calendar www
Features different views of the night sky, and Space Calendar, constellations, stars, planets, and other celestial wonders. Astronomy and Space Calendar.
- Information World Holidays: Weeks and Months www
Information on the origin of the week, Holidays: Weeks and Months, and etymology of month and weekday names. World Holidays: Weeks and Months.
- Questions The Difference Between the Millennium and Year 2000 www
Questions and answers to satisfy the hearts of true millennium buffs. The Difference Between the Millennium and Year 2000.
- The Ancient Observatories: Chaco Canyon www
The Exploratorium's multimedia website on the site of Chaco Canyon. Observatories: Chaco Canyon. Includes a webcast from the Winter Solstice 2004. Ancient Observatories: Chaco Canyon.
- Evidence Southern Stars: Aboriginal Astronomy www
Evidence of highly complex astronomy within Australian Aboriginal society. Southern Stars: Aboriginal Astronomy.
- A The Mathematics of the ISO 8601 Calendar www
A comprehensive document covering how week numbers are calculated using the ISO 8601 calendar system. Mathematics of the ISO 8601 Calendar. Includes links to many further resources. The Mathematics of the ISO 8601 Calendar.
- A ISO 8601 Date/Time Representations www
ISO 8601 Date/Time Representations.
- How Use International Date Format www
How and why to use international date format in your document - from the W3C QA section. Use International Date Format.
- Describes Sky & Telescope: Greek Marathon Dated from Phase of Moon www
Describes how astronomers used phase of Moon calculations and ancient Greek religious festivals to date the original Marathon run. Sky & Telescope: Greek Marathon Dated from Phase of Moon.
- Describes Moonstick Information Site www
Describes a slide rule Moon phase calendar accurate over 8000 years into the past or future, Information Site, and provides other methods of computing astronomical information. Moonstick Information Site.
- Resources Metrology Metro's Metric Links www
Resources for metrological and calibratory information, Metro's Metric Links, both US and SI, including quiz, events, books, jobs and contacts for sponsors and advertisers in Renfrew, Pennsylvania. Metrology Metro's Metric Links.
- Offers Metrology Forum www
Offers enlightenment to the uninitiated and soul-food for practitioners of electrical calibration. Forum. Includes standards, accreditation, quality and equipment management articles, maintained by Agilent Technologies, Palo Alto, California. Metrology Forum.
- Program Astronomical Sky Calendar www
Program that when given a particular date generates information, Sky Calendar, the Julian date, sun rise and set times, moon rise and set times, and percent illumination. Astronomical Sky Calendar.
- Month Que Tal www
Month at-a-glance, Tal, what's up, planet watch, phases and encounters sun watch, and star maps and charts. Que Tal.
- Multi Muse www
Multi Unit Spectroscopic Explorer. Muse. A second generation integral field spectrograph for the VLT. Proposed to European Southern Observatory (ESO) by the Centre de Recherche Astronomique de Lyon (CRAL). Muse.
- General Astronomy Education and Outreach www
General astronomy tutorial, Education and Outreach, education links, web courses, documents at the UCSD Center for Astrophysics and Space Sciences. Astronomy Education and Outreach.
- Alexa: Calendars and Timekeeping Astronomy
Alexa Directory Top Sites: Calendars and Timekeeping Astronomy
- DMOZ: Calendars and Timekeeping Astronomy
dmoz.org Directory: Calendars and Timekeeping Astronomy