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Astronomical symbols are symbols used to represent various celestial objects, theoretical constructs and observational events in astronomy. The earliest forms of these symbols appear in Greek papyri of late antiquity. The Byzantine codices in which the Greek papyri were preserved continued and extended the inventory of astronomical symbols.〔〔 New symbols were further invented to represent many just-discovered planets and minor planets discovered in the 18th-20th centuries. All these symbols were once commonly used by professional astronomers, amateur astronomers, and astrologers. While they are still commonly used in almanacs and astrological publications, their occurrence in published research and texts on astronomy is relatively infrequent, with some exceptions such as the Sun and Earth symbols appearing in astronomical constants, and certain zodiacal signs used to represent the solstices and equinoxes. Unicode has formally assigned codepoints to most symbols, mainly in (Miscellaneous Symbols Block (2600-26FF) )〔The Unicode Consortium〕 and (Miscellaneous Symbols and Pictographs Block (1F300-1F5FF) ).〔 == Symbols for the Sun and Moon == The use of astronomical symbols for the Sun and Moon dates to antiquity. The forms of the symbols that appear in the original papyri of Greek horoscopes are a circle with one ray () for the Sun and a crescent for the Moon. The modern sun symbol, a circle with a dot (☉), first appeared in Europe in the Renaissance.〔 These symbols are also known to be used in alchemy texts, sun was representing gold, moon representing silver and so on. In modern academic usage, the sun symbol is used for astronomical constants relating to the sun. The luminosity, mass, and radius of stars are often represented using the corresponding solar constants as units of measurement. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Astronomical symbols」の詳細全文を読む スポンサード リンク
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