Seven Regulators & Four Shadows vs. Western Astrology: Similarities and Differences

Seven Regulators & Four Shadows and Western astrology both begin with the same stars overhead, yet they grew into two different methods. Here is a point-by-point comparison of where they agree and where they part ways.

1. Seven Regulators & Four Shadows has no variety of house systems. It uses only the whole-sign system. Unlike Western astrology, where certain house systems let a single house straddle two signs, here that never happens.
2. Its Earthly Branches are the Western zodiac signs. The twelve branches and the twelve signs map directly onto each other.
3. The positions of the branches are fixed. The bottom of the chart is always zǐ (Aquarius), the left is mǎo (Scorpio), the right is yǒu (Taurus), and the top is wǔ (Leo).
4. It uses conceptual points. The Four Shadows are exactly that — conceptual points: virtual locations on the celestial sphere rather than physical bodies. In Western astrology these are called the Arabic Parts (Lots).
5. Like Western astrology, it has the grand trine. Shēn-zǐ-chén form the Water triplicity and hài-mǎo-wèi form the Wood triplicity. In Western terms, shēn-zǐ-chén is the Air grand trine of Gemini, Aquarius, and Libra; hài-mǎo-wèi is the Water grand trine of Pisces, Scorpio, and Cancer.
6. It does not use aspect orbs. Seven Regulators & Four Shadows does have its own version of the trine and the opposition, but it never measures orbs — a star simply needs to fall in the opposite house or a trine house to count.
7. Like Western astrology, it distinguishes day and night births (sect). The rule here is: by day use the Solar Stellar Regent (命度主) — found by carrying the Sun's degree across to the Life Palace and taking the ruler of the mansion at that exact-degree (partile) point — and by night use the Lunar Stellar Regent (身度主), the ruler of the mansion the Moon itself occupies.
8. Both have dignity, but its "exaltation" follows the solar terms. Western astrology reads a star's strength through domicile, exaltation, and fall; Seven Regulators & Four Shadows also has these, but its exaltation tracks the four seasons — Jupiter, for instance, is strong in spring and weak in autumn.
9. Both require the birthplace's latitude and longitude. Western astrology needs the coordinates; so does Seven Regulators & Four Shadows, to lay out the houses of the chart.
10. Western astrology reads through aspect angles; this reads through the Five Phases. Seven Regulators & Four Shadows interprets events through the generating and controlling cycles of the Five Phases (Metal, Wood, Water, Fire, Earth). Every star carries a Five-Phase nature, and so do the 28 lunar mansions.
11. So the two demand different time precision. Western astrology reads through aspect angles and relies on orbs to decide whether two stars are strongly linked, so it needs a precise time — down to the minute — or rectification from life events. Seven Regulators & Four Shadows reads through the energetic relationships of the Five Phases, so the two-hour double-hour usually suffices. Only when a birth time falls right at the boundary between two lunar mansions does the chart need finer rectification — I typically search in ten-minute steps to find the next mansion state.
12. The tools for timing events differ. Western astrology mainly uses Firdaria together with profections; Seven Regulators & Four Shadows mainly uses the Dongwei major periods together with the minor periods and the annual Tai Sui. The Dongwei periods are distinctive: they are read through the 28 lunar mansions, and each mansion differs in length, governs a different span of time, and carries its own nature — strengthening or weakening each star in the chart, and so triggering events.
13. The way they rank a person's eminence differs. Western astrology distinguishes eminence through essential dignity, fixed-star connections, the Arabic Parts, and the bounds; Seven Regulators & Four Shadows judges it through the eminence conferred on the stars themselves by the Heavenly-Stem stellar transformations.
14. Western astrology uses mean solar time; this uses true solar time. Because of that, the Western first house and the Life Palace can sometimes land in different branches. It comes down to the Sun's speed varying with the season rather than staying constant.