13 Zodiac and Explanation

Explanation from Raghunandan from the Planetary Society, India:

The order of the constellations of the Zodiac (as given by the apparent motion of the Sun over a year) starting with the Vernal Equinox and proceeding eastward along the Ecliptic is

PiscesThe FishesMarch12  to  April18
AriesThe RamApril19  to  May13
TaurusThe BullMay14  to  June19
GeminiThe TwinsJune20  to  July20
CancerThe CrabJuly21  to  August9
LeoThe LionAugust10  to  September15
VirgoThe MaidenSeptember16  to  October30
LibraThe BalanceOctober31  to  November22
ScorpiusThe ScorpionNovember23  to  November29
Ophiuchus**The Serpent-holderNovember30  to  December17
SagittariusThe ArcherDecember18  to  January18
CapricornusThe GoatJanuary19  to  February15
AquariusThe Water-bearerFebruary16  to  March11

The Constellations of the Zodiac :

The ancients observed that the Sun, Moon and those 5 funny wandering stars (the planets known to the ancients) seem to be constrained to a particular region of the sky, never traveling really far north or south of a wide band of stars. They divided this sky band into 12 sections based on the old constellations, each differing in width but all of them about 16° high (+8°/-8°) and called them the “Zodiac”. Each division is named for the constellation situated within its limits in the 2nd century B.C.!

The name “Zodiac” is derived from the Greek, meaning “animal circle” (also related to the word “zoo”), and it comes from the fact that most of these constellations are named for animals, such as Leo, the Lion, Taurus, the Bull and Cancer, the Crab. It turns out that this band of the sky is centered on a line called the “ecliptic” which is the apparent path the Sun appears to take through the sky as a result of the Earth’s revolution around it (actually, it is defined as the projection the Earth’s orbital plane into outer space). If we could see the stars in the daytime, we would see the Sun slowly wander from one constellation of the Zodiac to the next, making one complete circle around the sky in one year. Which constellation the Sun was in had to be inferred by drawing all the constellations, then noting which was the last to set before sunrise and which was the first to rise after sunset then assuming the Sun was half way in between.

Distance of Orion
88 Constellations

Source:

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