Subject: To quote the Wikipedia:
Author:
Posted on: 2016-09-17 18:54:00 UTC

Sub-article "Ophiucus and the Zodiac"

"Ophiuchus is one of thirteen constellations that cross the ecliptic. It has therefore been called the '13th sign of the zodiac'. However, this confuses sign with constellation.

The signs of the zodiac are a twelve-fold division of the ecliptic, so that each sign spans 30° of celestial longitude, approximately the distance the Sun travels in a month, and (in the Western tradition) are aligned with the seasons so that the March equinox always falls on the boundary between Pisces and Aries.

Constellations, on the other hand, are unequal in size and are based on the positions of the stars.
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From before the change.

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