Gregor Mendel

Biologist · Czech Republic · 1822–1884

Cancer 27.1° · born July 20, 1822
Birth time unknown

Birth date sourced. Birth time unknown.The Moon remained in Leo throughout that civil day. Jupiter crossed from Taurus into Gemini during that day, so its sign is left open. Everything below uses only what the complete civil day settles.

The day, read honestly

0.6° separates Mars and Neptune from an exact square; at that range drive and imagination read as one mechanism. Right angles are where the scheme puts its grit. A square asks two functions to work in a mode neither would have chosen.

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

Where the Sun actually stood

The Sun's position resolves to 27.1° Cancer — deep enough in the third decan (20°–30°) that Jupiter, its traditional sub-ruler, colours the reading.

The fast planets

Closer in, Mercury stands at 17.6° Cancer; Venus stands at 19.3° Gemini; Mars stands at 2.7° Libra. The tradition reads thought steeped in tone and memory from Mercury, attraction that begins as conversation from Venus, effort aimed through strategy and words from Mars.

The angles that hold

The tightest geometry in the chart puts Mars at right angles from Neptune, 0.6° off exact. The old texts treat a square as the aspect you feel earliest and thank latest: obstruction first, competence afterwards. Behind it, Jupiter sextile Pluto at 0.9°, and Uranus conjunction Neptune at 1.3° — both still well inside the orbs this site uses. All of it stands whatever the hour was: each angle was tested from midnight to midnight before it was written down.

Figures in the geometry

Mars opposes Pluto while both square Uranus. Two squares braced against one opposition make a t-square — the chart’s working end, where pressure keeps finding the same outlet. The Moon makes no major aspect that survives the day; the old reading gives such a planet autonomy — it acts alone, sometimes loudly.

The classical map

Read against the old dignities, one placement stands out. Mars in Libra at 2.7° is in detriment — the planet opposite its home, working against the grain. Dignity is a statement about conditions, not about worth.

The shape of the whole

Of the 9 placements whose signs hold for the whole day: 3 in earth, 2 in water, 2 in fire, 2 in air by element, 6 cardinal, 2 fixed, 1 mutable by modality. Jupiter crossed from Taurus into Gemini during that day, so its sign is left open. Mercury, Uranus, Neptune and Pluto were retrograde — apparent backward motion from where the Earth sits, which the tradition reads as a function turned inward before it is turned out.

The Moon, and how far it can move

The Moon stayed in Leo for the whole of that day at the birthplace, covering 13.8° between midnight and midnight. Fast enough that its degree is approximate, slow enough that its sign is not in doubt. At the noon reference it stands at 21.8°.

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

Source article: Gregor Mendel · revision 1363546656
Wikidata: Q37970 · revision 2521290954
Retrieved: 2026-07-26T18:47:50.947Z
Birth date: 1822-07-20 · day precision · proleptic-gregorian
Birthplace: Hynčice, Czech Republic · Q2711986
Coordinates: 49.6189, 17.8353 · from Hynčice
Reference instant: 1822-07-20T11:02:16.000Z · noon civil time, not a birth time
Omitted: Rising sign, houses, angles, and sect—all require a birth time.
Unknown-time range: Moon travelled 13.84° · The Moon remained in Leo throughout that civil day.
Open signs: Jupiter crossed from Taurus into Gemini during that day, so its sign is left open.
Engine: astronomy-engine (repository dependency) · @zodiacs/engine/internal/math
Portrait: Unknown author · public domain · Wikimedia Commons

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