[deleted off-topic comment - Moderator]
I posted the following information on another thread on this same subject some time ago when I stated:
"It is clear that both sidereal and tropical astrologers use 30 degree markings for the twelve constellations. In that sense these two zodiacs have that much in common therefore if it is a criticism, it is a criticism that applies to both tropical and sidereal astrology.
The precise documented reasons why the particular twelve constellations were chosen and why 30 degree segments were then assigned are no longer available and therefore must remain speculative.
The major difference that is non-speculative but is provable by direct personal experience, is that when one views the heavens as ancient astrologers did, without the aid of computers but by actually looking up at the skies visually and making notes and observations the difference then seems rather obvious
Ancient as well as modern astrologers viewed/may view the wandering stars, sun and moon in the foreground of constellations that are visible for those who wish to go outdoors, and confirm for themselves, directly in person, whether Libra or Virgo is actually rising on the Eastern horizon just before sunrise or not.
In contrast, for modern astrologers, although the Tropical zodiac looks fine on the computer screen. it is in fact totally out of synch with the reality of what is seen in the skies by anyone wishing to go outdoors and check.
The constellations or actual physical groups of stars associated with Images in the Sidereal Zodiac are much more closely aligned than are the Tropical 'signs'.
This is merely an observation on my part and not particularly intended as a criticism
Historical Note:
Before Copernicus:
850 C.E. – Ahmad ibn Muhammad ibn Kathīr al-Farghānī (Alfraganus) gives values for the obliquity of the ecliptic, the precessional movement of the apogees of the Sun
1150 – Indian mathematician-astronomer Bhāskara II, in the Siddhanta Shiromani, calculates the longitudes and latitudes of the planets, lunar and solar eclipses, risings and settings, the Moon's lunar crescent, syzygies, and conjunctions of the planets with each other and with the fixed stars, and explains the three problems of diurnal rotation
1150s – Bhaskara calculates the planetary mean motion, ellipses, first visibilities of the planets, the lunar crescent, the seasons, and the length of the Earth's revolution around the Sun to 9 decimal places.
~1350 – Ibn al-Shatir anticipates Copernicus by abandoning the equant of Ptolemy in his calculations of planetary motion, and he provides the first empirical model of lunar motion which accurately matches observations"
(and the division of a circle); however, Robson ("Fixed Stars and Constellations in Astrology") gives a method for converting measurement in space (the degrees) into measurement in time.! Now you sound like a homeopath (like me)
