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Does anyone know what the rising point in the astrolabe and ASC, DES, MC and IC stand for?
The rising constellation is also called the Palace of Life or the First House (Asc): the rising point is always at the eastern end of the horizon, where the sun rises every day.
Descending sign or seventh house (Dec): Located at the western end of the horizon, where the sun sets every day.
Midheaven is also called zenith and tenth house (MC): it is always at the top or south of the astrolabe.
The opposite point is called the lowest point and the fourth house (IC): it is always at the lowest or northern end of the astrolabe.
Extended data:
Mesopotamian astrologers divided the starry sky into several regions for the convenience of studying and observing many stars in the sky, and each region was a constellation. It's hard to say clearly when humans began to have the concept of constellation. This astronomical knowledge was known long before there was a historical record. The name of the constellation probably comes from the sailors who sailed early.
The origin of constellations may be completely different between civilizations in different regions, but with the expansion and mutual influence of civilizations, the culture of constellations also includes the process of integration.
In the second century, Ptolemy recorded 1022 stars in 48 constellations in his astronomical masterpiece, which is also the embryonic form of modern constellations. After that, many astronomers filled the Ptolemaic constellation with new constellations. Valle in 1603, Jahannes Hewelius in 1690, and Llakaj in 1752 have named the constellations in Nantian in two centuries.
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