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The sky on April 18, 1926 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–♀ 119.9°♄–♃ 87.5° ☿︎3° ☉︎27° ☽︎11° ♄︎24° ♂︎19° ♃︎22° ♀︎11°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 27.7° · sign Aries · constellation Aries
  • ☽︎ Moon — 101.4° · sign Cancer · constellation Gemini
  • ☿︎ Mercury — 3.5° · sign Aries · constellation Pisces
  • ♀︎ Venus — 341.4° · sign Pisces · constellation Aquarius
  • ♂︎ Mars — 319.0° · sign Aquarius · constellation Capricornus
  • ♃︎ Jupiter — 322.1° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 234.6° · sign Scorpio · constellation Libra
  • ☽︎ Moon 36% 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]

    first quarter, 36% lit; the Moon was 397,233 km away.

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

    100.5 orbits of the Sun — 94,418 million km, that is 122,813 return trips to the Moon; 36,696 rotations of Earth; with the Sun — 729.2 billion km around the Galactic centre, 28.2 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 218 million km away; today it is 244 million km (farther by 1.1×).

    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 November 11, 2027; Jupiter — in 2033; a full moon exactly on this date — April 18, 2030

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

    The vernal point has shifted 5,040″ since that day; the real constellations now sit 22.8° away from the astrologers’ “signs”.

    precession 50.29″/yr

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