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The sky on May 21, 1933 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♀–♂ 90.8° ☽︎27° ☿︎21° ☉︎29° ♀︎7° ♂︎8° ♃︎13° ♄︎16°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 60.0° · sign Taurus · constellation Taurus
  • ☽︎ Moon — 27.8° · sign Aries · constellation Pisces
  • ☿︎ Mercury — 51.3° · sign Taurus · constellation Aries
  • ♀︎ Venus — 67.9° · sign Gemini · constellation Taurus
  • ♂︎ Mars — 158.7° · sign Virgo · constellation Leo
  • ♃︎ Jupiter — 163.5° · sign Virgo · constellation Leo
  • ♄︎ Saturn — 316.4° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 8% 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]

    waning crescent, 8% lit; the Moon was 401,323 km away.

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

    93.4 orbits of the Sun — 87,749 million km, that is 114,138 return trips to the Moon; 34,104 rotations of Earth; with the Sun — 677.7 billion km around the Galactic centre, 26.2 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 168 million km away; today it is 246 million km (farther by 1.5×).

    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 June 6, 2027; Jupiter — in 2028.

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

    The vernal point has shifted 4,680″ since that day; the real constellations now sit 22.9° away from the astrologers’ “signs”.

    precession 50.29″/yr

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