Classical planet


In classical antiquity, the seven classical planets or seven sacred luminaires were the seven moving astronomical objects in the sky visible to the naked eye: the Moon, Mercury, Venus, the Sun, Mars, Jupiter, and Saturn. The word planet comes from two related Greek words, πλάνης planēs and πλανήτης planētēs, both with the original meaning of "wanderer", expressing the fact that these objects move across the celestial sphere relative to the fixed stars. Greek astronomers such as Geminus and Ptolemy often divided the seven planets into the Sun, the Moon, and the five planets.
The term planet in modern terminology is only applied to natural satellites directly orbiting the Sun, so that of the seven classical planets, five are planets in the modern sense.

Babylonian astronomy

The Babylonians recognized seven planets. A bilingual list in the British Museum records the seven Babylonian planets in this order:
Sumerian languageAkkadian languageCelestial objectPresiding deity
AkuSinMoonSin/Suen
BišebiŠamašSunŠamaš
Dapinu Umun-sig-êaJupiterMarduk/Amarutu
Zib/ZigDele-batVenusIštar
Lu-limLu-bat-sag-ušSaturnNinib/Nirig/Ninip
BibbuLubat-gudMercuryNabu/Nebo
SimutuMuštabarruMarsNergal

Symbols

The astrological symbols for the classical planets appear in the medieval Byzantine codices in which many ancient horoscopes were preserved. In the original papyri of these Greek horoscopes, there are found a circle with one ray for the Sun and a crescent for the Moon.
The written symbols for Mercury, Venus, Jupiter, and Saturn have been traced to forms found in late Greek papyri. The symbols for Jupiter and Saturn are identified as monograms of the initial letters of the corresponding Greek names, and the symbol for Mercury is a stylized caduceus.
A. S. D. Maunder finds antecedents of the planetary symbols in earlier sources, used to represent the gods associated with the classical planets. Bianchini's planisphere, produced in the 2nd century, shows Greek personifications of planetary gods charged with early versions of the planetary symbols: Mercury has a caduceus; Venus has, attached to her necklace, a cord connected to another necklace; Mars, a spear; Jupiter, a staff; Saturn, a scythe; the Sun, a circlet with rays radiating from it; and the Moon, a headdress with a crescent attached.
A diagram in Johannes Kamateros' 12th century Compendium of Astrology shows the Sun represented by the circle with a ray, Jupiter by the letter zeta, Mars by a shield crossed by a spear, and the remaining classical planets by symbols resembling the modern ones, without the cross-mark seen in modern versions of the symbols. The modern Sun symbol, pictured as a circle with a dot, first appeared in the Renaissance.

Planetary hours

The Ptolemaic system used in Greek astronomy placed the planets in order, closest to Earth to furthest, as the Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn. In addition the day was divided into 7 hour intervals, each ruled by one of the planets, although the order was staggered.
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-day.
The modern English days of the week were inherited from gods of the old Germanic Norse culture — Wednesday is Wōden’s-day, Thursday is Thor’s-day, Friday is Frige-day. It can be correlated that the Norse gods were attributed to each Roman planet and its god, probably due to Roman influence rather than coincidentally by the naming of the planets.

Alchemy

In alchemy, each classical planet was associated with one of the seven metals known to the classical world. As a result, the alchemical glyphs for the metal and associated planet coincide. Alchemists believed the other elemental metals were variants of these seven.
Alchemy in the Western World and other locations where it was widely practiced was allied and intertwined with traditional Babylonian-Greek style astrology; in numerous ways they were built to complement each other in the search for hidden knowledge. Astrology has used the concept of classical elements from antiquity up until the present day today. Most modern astrologers use the four classical elements extensively, and indeed they are still viewed as a critical part of interpreting the astrological chart.
’s The Last Will and Testament, 1670 ce.
Traditionally, each of the seven "planets" in the solar system as known to the ancients was associated with, held dominion over, and "ruled" a certain metal.
The list of rulership is as follows:
Some alchemists adopted the Hermetic Qabalah assignment between the vital organs and the planets as follows:
PlanetOrgan
SunHeart
MoonBrain
MercuryLungs
VenusKidneys
MarsGall bladder
JupiterLiver
SaturnSpleen

Contemporary astrology

Western astrology

PlanetDomicile signDetriment signExaltation signFall signJoy sign
SunLeoAquariusAriesLibraSagittarius
MoonCancerCapricornTaurusScorpioPisces, Libra
MercuryGemini and Virgo Sagittarius and Pisces VirgoPiscesAries, Scorpio, Capricorn and Aquarius
VenusLibra and Taurus Aries and Scorpio PiscesVirgoGemini, Cancer and Aquarius
MarsAries and Scorpio Libra and Taurus CapricornCancerGemini, Leo, Virgo and Sagittarius
JupiterSagittarius and Pisces Gemini and Virgo CancerCapricornTaurus, Leo and Libra
SaturnAquarius and Capricorn Leo and Cancer LibraAriesGemini, Virgo and Scorpio

Indian astrology

Indian astronomy and astrology recognises seven visible planets and two additional invisible planets.
Sanskrit NameTamil nameEnglish NameGunaRepresentsDay
Surya ஞாயிறுSunSattvaSoul, king, highly placed persons, father, egoSunday
Chandra திங்கள்,மதி, நிலவு MoonSattvaEmotional Mind, queen, mother.Monday
Mangala செவ்வாய், செம்மீன் MarsTamasenergy, action, confidenceTuesday
Budha புதன்MercuryRajasCommunication and analysis, mindWednesday
Brihaspati வியாழன், பொன்மீன் JupiterSattvathe great teacher, wealth, Expansion, progenyThursday
Shukra வெள்ளி, வெண்மீன் VenusRajasFeminine, pleasure and reproduction, Luxury, Love, SpouseFriday
Shani சனி, மைம்மீன் SaturnTamaslearning the hard way. Career and Longevity, ContractionSaturday
Rahu கரும்பாம்புAscending/North Lunar NodeTamasan Asura who does his best to plunge any area of one's life he controls into chaos, works on the subconscious levelnone
Ketu செம்பாம்புDescending/South Lunar NodeTamassupernatural influences, works on the subconscious levelnone

Chinese astronomy

The cycles of the Chinese calendar are linked to the orbit of Jupiter, there being 12 sacred beasts in the Chinese dodecannualar geomantic and astrological cycle, and 12 years in the orbit of Jupiter.
English NameAssociated elementChinese/Japanese/Korean Hanja CharactersChinese pinyinJapanese hiragana/romajiKorean Hangul VietnameseOld astronomical names
Mercurywater水星Shuǐxīngすいせい/Suisei수성 Sao ThủyChénxīng
Venusmetal/gold金星Jīnxīngきんせい/Kinsei금성 Sao Kim, also "Sao Mai" as "morning star" and "Sao Hôm" as "evening star"Tàibái
Marsfire火星Huǒxīngかせい/Kasei화성 Sao HỏaYínghuò
Jupiterwood木星Mùxīngもくせい/Mokusei목성 Sao MộcSuì
Saturnearth土星Tǔxīngどせい/Dosei토성 Sao ThổZhènxīng

Naked-eye planets

Mercury and Venus are visible only in twilight hours because their orbits are interior to that of Earth. Venus is the third-brightest object in the sky and the most prominent planet. Mercury is more difficult to see due to its proximity to the Sun. Lengthy twilight and an extremely low angle at maximum elongations make optical filters necessary to see Mercury from extreme polar locations. Mars is at its brightest when it is in opposition, which occurs approximately every twenty-five months. Jupiter and Saturn are the largest of the five planets, but are farther from the Sun, and therefore receive less sunlight. Nonetheless, Jupiter is often the next brightest object in the sky after Venus. Saturn's luminosity is often enhanced by its rings, which reflect light to varying degrees, depending on their inclination to the ecliptic; however, the rings themselves are not visible to the naked eye from the Earth. Uranus and sometimes the asteroid Vesta are in principle visible to the naked eye on very clear nights, but, unlike the true naked-eye planets, are always less luminous than several thousands of stars, and as such, do not stand out enough for their existence to be noticed without the aid of a telescope.