Astronomical+almanac+or+calendar
81chronology — /kreuh nol euh jee/, n., pl. chronologies. 1. the sequential order in which past events occur. 2. a statement of this order. 3. the science of arranging time in periods and ascertaining the dates and historical order of past events. 4. a… …
82Mesoamerican calendars — Stelae 12 and 13 from Monte Alban, provisionally dated to 500 400 BCE, showing what is thought to be one of the earliest calendric representations in Mesoamerica.[1] Mesoamerican calendars are the calendrical systems devised and used by the pre… …
83Timeline of Islamic science and engineering — This timeline of Islamic science and engineering covers the general development of science and technology in the Islamic world during the Islamic Golden Age, usually dated from the 7th to 16th centuries.From the 17th century onwards, the advances …
84Blue moon — This article is about the astronomical phenomenon. For other uses, see Blue Moon (disambiguation). 31 December 2009 Blue Moon with partial lunar eclipse A blue moon can refer to the third full moon in a season with four full moons …
85Lunar distance (navigation) — For the history of the lunar distance method, see History of longitude. Finding Greenwich time while at sea using a lunar distance. The Lunar Distance is the angle between the Moon and a star (or the Sun). The altitudes of the two bodies are used …
86Maya civilization — This article is about the pre Columbian Maya civilization. For a discussion of the modern Maya, see Maya peoples. For other meanings of the word Maya, see Maya …
87Muḥammad ibn Mūsā al-Khwārizmī — al Khwārizmī redirects here. For other uses, see al Khwārizmī (disambiguation). Muḥammad ibn Mūsā al Khwārizmī …
88Full moon — [ Galileo spacecraft on 7 December 1992. The color is enhanced in the sense that the CCD camera is sensitive to near infrared wavelengths of light beyond human vision.] Full moon is a lunar phase that occurs when the Moon is on the opposite side… …
89Second — This article is about the unit of time. For other uses, see Second (disambiguation). A light flashing approximately once per second. The second (SI unit symbol: s; informal abbreviation: sec) is a unit of measurement of time, and is the… …
90Conversion between Julian and Gregorian calendars — The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering. Contents 1 Conventions 2 Conversion table 3 Using the tables …
