Ophiuchus: Astronomy or Astrology
Most people will get confuse on the difference between Astronomy and Astrology. An example of this is the latest hype on Ophiuchus as the new 13th zodiac sign in Astrology.
In Astronomy, Ophiuchus is one of the zodiac constellations (constellations inside the ecliptic, the apparent path of the Sun in the sky during the year) and part of the official 88 constellations recognized by the International Astronomical Union (IAU). You can actually find the Ophiuchus constellation a little above Scorpius and Sagittarius in the night sky.
Ophiuchus may be new in the astrological zodiac sign but not in Astronomy. It has been known by people who religiously look at the sky since ancient times.
Here’s a blog that will give you a better picture about Ophiuchus: http://starcrosser.blogspot.com/2011/01/ophiucus-and-13th-zodiac.html . The author explained well how the changes in the ecliptic affect astrologers’ predictions.
In summary, Astronomy and Astrology are definitely two different things: the former studies the science of the Universe while the latter relates the Universe to human behavior.