Doryphory Calculator — Your Chart's Spear-Bearer

What doryphory and prodorima are

The doryphory is the nearest planet ahead of an anchor. Ahead means in the natural zodiac order, so a body just past the Ascendant degree counts first. Its distance is the smallest forward arc any body occupies.

The prodorima is the mirror-image idea. It is the nearest planet behind the anchor. Its distance is the smallest backward arc. Between the two, you get the pair of bodies flanking the anchor along the ecliptic.

Classically, the doryphory was read as the standard-bearer of the anchor. It colours how the anchor's intent plays out. The prodorima was read as the forerunner. It colours the tone that led up to the anchor in the first place.

How we choose the pair

For each target, we walk through every body in the chart and measure two arcs. The forward arc runs from the target up to the body in zodiac order. The backward arc runs the other way. We wrap both into the range 0 to 360 degrees.

The doryphory is the body with the smallest positive forward arc. The prodorima is the body with the smallest positive backward arc. A distance of zero is skipped, because a body cannot be at the same degree as the target for our purposes.

When the target is the Sun, we exclude the Sun itself from the candidate list. When the target is the Ascendant, all ten placements are fair candidates, since the Ascendant is not a body. Every distance is in ecliptic degrees, not in signs.

What the report returns

The tool shows one block per anchor, each with two labeled fields:

• The doryphory: name, glyph, sign, and forward arc from the anchor.
• The prodorima: name, glyph, sign, and backward arc from the anchor.
• The Ascendant and the Sun are always included.
• Distances are measured on the whole-sign frame, so they hold regardless of house system.

A worked example: Moon and Saturn flank the Ascendant

Take the London chart at 1 January 2000, 17:30 UT. The Ascendant sits at 118.81 degrees, near the end of Cancer. Ten bodies stand around the wheel, and the arc test picks out the closest on each side.

Ahead of the Ascendant, the smallest forward arc belongs to the Moon in Scorpio. It sits 107.27 degrees past the Ascendant, further along the wheel. Behind the Ascendant, the smallest backward arc belongs to Saturn in Taurus, 78.41 degrees short of the Ascendant.

For the Sun, the story is different. The Sun itself sits at 10.60 degrees of Capricorn. Neptune in Aquarius follows at only 22.60 degrees ahead, so Neptune is the Sun's doryphory. Mercury, in the same sign just behind the Sun, is only 8.36 degrees back. The Sun is flanked closely here, and the mind is right at its shoulder.

Every number in this example is measured directly by the site's automated probe, on the same ephemeris that powers the rest of the site. If your chart places a different body at the Ascendant's shoulder, the reading changes with it.

Reading the spear-bearer

Start with the anchor. The Ascendant is the shape of the self, the way you enter a room. The Sun is the will, the purpose the life is circling. Each gets its own pair of companions.

Then read the doryphory. This is the planet that carries the anchor forward. If the Ascendant's doryphory is the Moon, the self moves through feeling and care. If it is Mars, the self moves through drive and confrontation.

Finally read the prodorima. This is the planet whose tone the anchor is inheriting. It sets the mood that led to your Ascendant, or the motive that led to your Sun. The two companions together describe the immediate neighborhood of the anchor.

One more thing is worth noticing: the pair is never fixed. The Ascendant sweeps a full sign every two hours, so its doryphory changes several times across a single day. That is why an uncertain birth time matters here more than almost anywhere else in the chart. Two hours either side of your recorded time can hand the spear to a different planet entirely.

What this tool does not claim

Doryphory is a positional rule, not a measured physical effect. It picks the closest body in a specific direction, nothing more. The interpretive tradition adds the rest, and you should treat that layer as a lens.

Because the anchors move at four degrees per minute and the planets crawl, a birth time near the Ascendant-Sun boundary can flip which body is the doryphory. If your time is uncertain, check both neighbors on either side.

We use only the Ascendant and the Sun here. Some classical authors also assign a doryphory to the Midheaven and to the Part of Fortune. Those anchors are covered in the Traditional Chart and Lots pages.

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). Doryphory and prodorima use the same forward-and-backward arc test described above. Every worked-example figure is reproduced by an automated probe. Reviewed by Dr. Amara Osei, Astronomy Reviewer.