Oriental & Occidental Planets — Which Side of the Sun You Were Born On

The oriental and occidental split

Picture the ecliptic as a clock. The Sun stands at some point. Two halves of the wheel open from it. Planets in the half ahead of the Sun, measured forward in zodiac order past 180 degrees, rise before the Sun each morning. They are oriental. Planets in the half behind the Sun rise after it. They are occidental.

Oriental planets carry the classical tone of initiative. They act first, want first, and set out from themselves. Occidental planets carry the tone of reception. They respond, adapt, and are shaped by what arrives. Both sides are ordinary. Everyone has some of each.

The Sun itself is on the boundary and belongs to neither group. We exclude it from the list. In practice, that means you will see the split applied to nine bodies: the Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.

How we assign each planet

One number decides everything: the forward arc from the Sun. We take the planet's ecliptic longitude, subtract the Sun's longitude, and wrap the result into the range zero to 360 degrees. That gives the arc along the zodiac from the Sun to the planet.

If that arc is at least 180 degrees, the planet is oriental. If it is under 180, the planet is occidental. This is exactly the classical test stated in modern coordinates. Nothing else enters into it.

The test uses positions from the ephemeris, so it is stable. It does not care about your birth minute, the house system, or the local horizon. The split is the same whether the sky is measured from London or Sydney.

What the report returns

The tool shows both sides of your sky, each as a full list:

• Every oriental body, with its glyph, name and arc from the Sun.
• Every occidental body, with the same three fields.
• A one-line count of the split, so you can see the balance at a glance.
• The Sun is called out as neither, since it sits on the boundary.

A worked example: a mixed sky

Take the London chart dated 1 January 2000 at 17:30 UT. The Sun sits in Capricorn, near the sign boundary. Nine bodies are placed around the wheel, and the arc test splits them cleanly into oriental and occidental.

Oriental bodies: the Moon in Scorpio, Mercury in Capricorn, Venus in Sagittarius, and Pluto in Sagittarius. Each one's forward arc from the Sun is above 180 degrees, so they rise before them. On a morning sky, you would see them before sunrise.

Occidental bodies: Mars and Neptune in Aquarius, Jupiter in Aries, Saturn in Taurus, and Uranus in Aquarius. Their forward arcs sit under 180 degrees. They trail the Sun and rise after it, closer to evening.

The balance is four to five. Nothing is unusual there. A very lopsided sky can be interesting to read, but the classical authors treated a mixed chart as the ordinary case, not the exception.

Reading the split

Count your two sides. A chart with more oriental planets reads as self-starting. The person tends to move first, want first, and set the pace. A chart with more occidental planets reads as receptive. The person tends to answer, reflect and take cues from what is already moving.

Then note which planets sit on each side. An oriental Mars takes initiative through drive. An occidental Mars adapts through drive. Same planet, different flavor. The classical authors paid close attention to these side-assignments in elections.

Finally, weigh the picture against sect. Diurnal and nocturnal charts treat the two sides a little differently, because day and night shift which luminary leads. Sect is a companion technique, and we cover it on the Traditional Chart page.

A strongly tilted sky is easier to read. If six or more bodies sit on one side of the Sun, that side becomes a keynote of the life. A near-even split, like four and five, means both styles are available, and the story depends more on sign, house and dignity than on the arc rule alone.

What this tool does not claim

The oriental and occidental labels are not the same as morning and evening stars. Those terms apply specifically to planets near the Sun in the sky, and they change week to week. The chart-level split is stable for the whole day of your birth.

We use one rule: forward arc from the Sun, split at 180 degrees. Some later authors apply the labels only to the traditional seven. We include the modern bodies so you can see the full nine, and clearly note that they are extras.

The reading is a traditional lens, not a measured personality fact. It is a compact way of describing where the sky sits around the Sun on the day you were born. Treat the interpretation as one voice among many.

Because we split on longitude only, the result ignores your local horizon. The classical authors did the same. Two people born at the same moment in different cities get the same oriental and occidental lists, even though the actual rising order in the sky differs.

Our method in one line

Positions come from sub-arcsecond astronomy (VSOP87/ELP via astronomy-engine), read through Porphyry quadrant houses (whole-sign available on every chart). The oriental and occidental split is measured with a single arc rule stated above. Every worked-example figure is reproduced by an automated probe. Reviewed by Dr. Amara Osei, Astronomy Reviewer.