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The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.
BoBn — Boeshaar-Bond (planetary nebulae) (for example: BoBn 1, an extragalactic planetary nebula at 0:37 / -13°42' in Cetus) Bode — (telescopic asterisms) Boe — Boeger (double stars) Bogleiv (open star clusters) Bonatto (open star clusters) Boo — Samuel Latimer Boothroyd, 1874–1965 (double stars) Boy — Bowyer (double stars)
The first hour of each day was named after the ruling planet, giving rise to the names and order of the Roman seven-day week. Modern Latin-based cultures, in general, directly inherited the days of the week from the Romans and they were named after the classical planets; for example, in Spanish Miércoles is Mercury, and in French mardi is Mars ...
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
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Jones-Emberson 1 (PK 164+31.1), also known as the Headphone Nebula, is a 14th magnitude planetary nebula in the constellation Lynx at a distance of 1600 light years. It is a larger planetary with low surface brightness. The 16.8-magnitude central star is a very blue white dwarf.
14:56:38 Mercury 1°01' south of Jupiter 6.4° East November 13, 2017 06:10:03 Venus 17' north of Jupiter 13.8° West November 28, 2017 09:36:06 Mercury 3°03' south of Saturn 21.1° East December 6, 2017 11:29:41 Mercury 1°21' south of Saturn 13.9° East December 15, 2017 16:04:48 Mercury 2°14' north of Venus 5.9° West December 25, 2017
A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.787 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.