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The sky on September 21, 1926 — as it really was

That day the Sun stood in Virgo — sign and constellation agree here.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♃ 90.9°♄–☽ 120.7° ♂︎19° ♀︎12° ☉︎27° ☿︎29° ♄︎22° ♃︎18° ☽︎22°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 177.7° · sign Virgo · constellation Virgo
  • ☽︎ Moon — 352.8° · sign Pisces · constellation Aquarius
  • ☿︎ Mercury — 179.3° · sign Virgo · constellation Virgo
  • ♀︎ Venus — 162.1° · sign Virgo · constellation Leo
  • ♂︎ Mars — 49.0° · sign Taurus · constellation Aries
  • ♃︎ Jupiter — 318.2° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 232.1° · sign Scorpio · constellation Libra
  • ☽︎ Moon 100% illuminated

astronomy-engine ephemerides (VSOP87/ELP), IAU 1930 constellation boundaries. Positions accurate to a fraction of a degree.

The day’s dossier, from real data

Checkable facts with a tag and a source; the classical reading is in the chart.

  1. The Moon that day [EXACT]

    full moon, 100% lit; the Moon was 357,465 km away.

    astronomy-engine
  2. How far Earth has travelled since [EXACT]

    100 orbits of the Sun — 94,012 million km, that is 122,284 return trips to the Moon; 36,538 rotations of Earth; with the Sun — 726.1 billion km around the Galactic centre, 28 light-days.

    29.78 km/s along the orbit; 230 km/s around the Galactic centre
  3. Mars then and now [EXACT]

    On that day Mars was 82 million km away; today it is 245 million km (farther by 3×).

    astronomy-engine; checked against JPL Horizons for 2026-09-14
  4. When the sky repeats [EXACT]

    Mars returns to that day’s point of its orbit on April 15, 2028; Jupiter — in 2033; a full moon exactly on this date — September 20, 2040

    sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
  5. How far the sky has drifted since [EXACT]

    The vernal point has shifted 5,004″ since that day; the real constellations now sit 22.8° away from the astrologers’ “signs”.

    precession 50.29″/yr

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