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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 70. Chapters: Leap year, Month, Second, Week, Sidereal time, Sidereal year, Day, Minute, Stage, Hour, Era, Century, Global Boundary Stratotype Section and Point, Calendar year, Saeculum, Planck time, Fortnight, Week-day names, Tropical year, Geologic Calendar, Season, Millennium, Seven-day week, Sothic cycle, Yuga, Cenomanian, Kalpa, Erathem, Tide, Julian year, Swatch Internet Time, Cosmic Calendar, Friedman, Long weekend, Jiffy, Chronozone, Epact, Global Standard Stratigraphic Age, Chronon, Indiction, Pahar, Tithi, Unit of time, Decade, Lunar month, Samvatsara, Cosmological decade, Lustrum, List of leap years, Galactic year, Bya, Instant, Seconds pendulum, Seasonal year, Century leap year, Svedberg, Common year, Byr, Lunar day, Myr, Nychthemeron, Palya, Gya, Synodic day, Paksa, Samay, Kyr, Paher, Gaussian year, Shake, Atom, Rolling 12 month period, Half-month, D-value, Helek, ISO 31-2, Gāh, Lunar fortnight. Excerpt: The names of the days of the week from the Roman period have been both named after the seven planets of classical astronomy and numbered, beginning with Sunday. In Slavic languages, a numbering system was adopted, but beginning with Monday. There was an even older tradition of names in Ancient Indian Astrology which could arguably be the origin of all these naming systems. All of these systems was adopted in many languages, with some exceptions resulting from a number of religious and secular considerations. Weekday heptagramThe order of the week days can be derived "geometrically" from an acute heptagram, the star polygon (as 24 mod 7 = 3). The luminaries are arranged in the same Ptolemaic/Stoic order around the points of the heptagram. Tracing the unicursal line from one planet to the next gives the order of the weekdays. This weekday heptagram is a development of Hellenistic astrology, and probably dates to the Ro...
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