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The Astronomical Almanac [1] is an almanac published by the United Kingdom Hydrographic Office; it also includes data supplied by many scientists from around the world.On page vii, the listed major contributors to its various Sections are: H.M Nautical Almanac Office, United Kingdom Hydrographic Office; the Nautical Almanac Office, United States Naval Observatory; the Jet Propulsion Laboratory ...
The first major Arabic work of astronomy is the Zij al-Sindh by Muhammad ibn Musa al-Khwarizmi. The work contains tables for the movements of the Sun, the Moon, and the five planets known at the time. The work is significant as it introduced Ptolemaic concepts into Islamic sciences. This work also marks the turning point in Arabic astronomy.
In [Astronomical Algorithms], the 'B.C.' years are counted astronomically. Thus, the year before the year +1 is the year zero, and the year preceding the latter is the year −1. The year which historians call 585 B.C. is actually the year −584. The astronomical counting of the negative years is the only one suitable for arithmetical purpose.
February 26, 2008 02:34:04 Mercury 1°20' north of Venus 26.1° West March 6, 2008 20:14:29 Venus 36' south of Neptune 24° West March 9, 2008 02:48:02 Mercury 56' south of Neptune 26.2° West March 23, 2008 10:13:50 Mercury 1°03' south of Venus 20.3° West March 27, 2008 17:00:46 Venus 45' south of Uranus 18.6° West June 8, 2008 00:51:42
Sagan goes on to extend the comparison in terms of surface area, explaining that if the Cosmic Calendar were scaled to the size of a football field, then "all of human history would occupy an area the size of [his] hand". [3] A similar analogy used to visualize the geologic time scale and the history of life on Earth is the Geologic Calendar.
1576 – Royal Danish Astronomical Observatory Uraniborg at Hven by Tycho Brahe; 1577–80 – Taqi al-Din invents a mechanical astronomical clock that measures time in seconds, one of the most important innovations in 16th-century practical astronomy, as previous clocks were not accurate enough to be used for astronomical purposes. [13]
The year begins with the first sight of Spring.In the Julian calendar, the vernal equinox moved gradually away from 21 March.The Gregorian calendar reform restored the vernal equinox to its original date, but since the festival was by now tied to the date, not the astronomical event, Kha b-Nisan remains fixed at 21 March in the Julian reckoning, corresponding to 1 April in the Gregorian calendar.
Astronomy-related events and competitions: ... 2008: Spring: May 10: May 12 2009: Spring: May 2: May 1 2010: ... 2016 Spring May 14 May 13 Autumn October 8