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The sky on August 20, 1953 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–♄ 121.3°☉–☽ 121.8° ♃︎21° ♀︎18° ☿︎10° ♂︎13° ☉︎27° ♄︎23° ☽︎28°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 147.2° · sign Leo · constellation Leo
  • ☽︎ Moon — 268.9° · sign Sagittarius · constellation Sagittarius
  • ☿︎ Mercury — 130.7° · sign Leo · constellation Cancer
  • ♀︎ Venus — 108.8° · sign Cancer · constellation Gemini
  • ♂︎ Mars — 133.9° · sign Leo · constellation Cancer
  • ♃︎ Jupiter — 81.8° · sign Gemini · constellation Taurus
  • ♄︎ Saturn — 203.1° · sign Libra · constellation Virgo
  • ☽︎ Moon 76% 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]

    waxing gibbous, 76% lit; the Moon was 379,495 km away.

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

    73.1 orbits of the Sun — 68,724 million km, that is 89,392 return trips to the Moon; 26,710 rotations of Earth; with the Sun — 530.8 billion km around the Galactic centre, 20.5 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 391 million km away; today it is 244 million km (closer by 1.6×).

    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 December 27, 2026; Jupiter — in 2036; a full moon exactly on this date — August 20, 2062

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

    The vernal point has shifted 3,672″ since that day; the real constellations now sit 23.2° away from the astrologers’ “signs”.

    precession 50.29″/yr

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