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The use of astronomical symbols for the Sun and Moon dates to antiquity. The forms of the symbols that appear in the original papyrus texts of Greek horoscopes are a circle with one ray for the Sun and a crescent for the Moon. [3] The modern Sun symbol, a circle with a dot (☉), first appeared in Europe in the Renaissance. [3]
The solar disk, crescent Moon and stars as shown on the Nebra sky disk (c. 1600 BC) The basic element of most solar symbols is the circular solar disk. The disk can be modified in various ways, notably by adding rays (found in the Bronze Age in Egyptian depictions of Aten) or a cross.
Planetary symbols are used in astrology and traditionally in astronomy to represent a classical planet (which includes the Sun and the Moon) or one of the modern planets. The classical symbols were also used in alchemy for the seven metals known to the ancients, which were associated with the planets, and in calendars for the seven days of the week associated with the seven planets.
Orbital Parameters of a Cosmic Object: . α - RA, right ascension, if the Greek letter does not appear, á letter will appear. δ - Dec, declination, if the Greek letter does not appear, ä letter will appear.
The conventional symbols for the signs of the zodiac also develop in the Renaissance period as simplifications of the classical pictorial representations of the signs.) [citation needed] The modern sun symbol resembles the Egyptian hieroglyph for "sun" – a circle that sometimes had a dot in the center, (U+131F3 ㇳ EGYPTIAN HIEROGLYPH N005).
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Gold (Alchemical symbols: planetary metals) Gardiner N5 (U+131F3 ㇳ EGYPTIAN HIEROGLYPH N005): The sun, part of the representation of the name of Ra in Egyptian hieroglyphs. (This hieroglyph is shown conventionally with a small circle (rather than a dot) with the larger circle. The sun / a day (Chinese oracle script, the modern character being ...
Hazard symbols; List of mathematical constants (typically letters and compound symbols) Glossary of mathematical symbols; List of physical constants (typically letters and compound symbols) List of common physics notations (typically letters used as variable names in equations) Rod of Asclepius / Caduceus as a symbol of medicine