Denis Diderot

Philosopher · France · 1713–1784

Libra 12.1° · born October 5, 1713
Birth time unknown

Birth date sourced. Birth time unknown.Moon sign undetermined. The Moon crossed from Aries into Taurus during that day. Everything below uses only what the complete civil day settles.

The day, read honestly

Four of the nine placements whose signs are settled stand in Virgo — Mercury, Saturn, Uranus and Pluto. The placements whose signs could change with an unknown hour are not counted. A cluster that size becomes the section the rest of the chart plays around.

Positions at 12:00 civil time in Langres—a reference instant, not a birth time. No houses, rising sign, angles, or sect were computed.

Where the Sun actually stood

Measured rather than labelled, the Sun holds 12.1° Libra: the second decan, whose classical sub-ruler is Saturn. A air sign, read here in its second face.

Closer to the ground

Day to day the chart speaks through Mercury in Virgo (24.2°), Venus in Leo (29.4°), Mars in Sagittarius (3.9°): a mind that trusts the measured and the checked, taste that runs toward the vivid and the immediate, drive that ignites on contact.

The angles that hold

The tightest geometry in the chart puts Saturn a third of the circle apart from Neptune, 0.2° off exact. The scheme reads trines as water finding its level: effortless, and invisible to the person living it. Behind it, Mars square Jupiter at 0.3°, and Neptune trine Pluto at 0.8° — both still well inside the orbs this site uses. Each angle here was measured at every hour of the civil day and held; whatever the missing clock said, this geometry was in it.

The standing structure

Venus opposes Jupiter while both square Mars. A t-square aims the whole axis at its apex planet; the tradition reads it as the chart’s standing assignment. The Sun stands apart from every major angle the day held — the tradition reads an unaspected planet as a voice that speaks on its own schedule, unmodulated by the rest of the chart.

The classical map

The classical table has three entries for this chart. The Sun in Libra at 12.1° is in fall — the tradition’s uphill placement, strength earned rather than given; Mercury in Virgo at 24.2° is in exaltation — the tradition’s honoured-guest placement, working at its best; Jupiter in Pisces at 4.1° is in domicile — the planet in its own sign, running on home rules. The old table grades terrain, not talent — a placement in fall works uphill, nothing more.

The shape of the whole

Among the 9 placements whose signs hold for the whole day, the elements divide 5 earth, 2 fire, 1 air, 1 water; by modality, 6 mutable, 2 fixed, 1 cardinal. An earth emphasis reads as patience with material reality — slow hands, durable results. Jupiter and Neptune were retrograde — apparent retreat against the stars, which the old reading takes as a function working from the inside first.

The Moon is genuinely open

The Moon crossed from Aries into Taurus during that day at the birthplace, travelling 14.0° between one midnight and the next. Without a recorded hour there is no honest way to say which side it was on, so this reading does not say. The Moon sign is a real question here, not a rounding error, and it needs a birth time nobody has published.

Where this comes fromSources, revisions, and exactly what this chart assumes

Source article: Denis Diderot · revision 1358122174
Wikidata: Q448 · revision 2522267795
Retrieved: 2026-07-26T18:47:50.947Z
Birth date: 1713-10-05 · day precision · proleptic-gregorian
Birthplace: Langres, France · Q203293
Coordinates: 47.8625, 5.3331 · from Langres
Reference instant: 1713-10-05T11:50:39.000Z · noon civil time, not a birth time
Omitted: Rising sign, houses, angles, and sect—all require a birth time.
Unknown-time range: Moon travelled 14.05° · Moon sign undetermined. The Moon crossed from Aries into Taurus during that day.
Engine: astronomy-engine (repository dependency) · @zodiacs/engine/internal/math
Portrait: Pierre-Michel Alix · public domain · Wikimedia Commons

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