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The sky on April 20, 1950 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☉–♃ 58.9°♄–♀ 179.4° ☉︎29° ☿︎19° ☽︎4° ♄︎13° ♂︎23° ♃︎0° ♀︎13°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 29.8° · sign Aries · constellation Aries
  • ☽︎ Moon — 64.0° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 49.6° · sign Taurus · constellation Aries
  • ♀︎ Venus — 343.8° · sign Pisces · constellation Aquarius
  • ♂︎ Mars — 173.1° · sign Virgo · constellation Virgo
  • ♃︎ Jupiter — 330.9° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 163.1° · sign Virgo · constellation Leo
  • ☽︎ Moon 9% 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 crescent, 9% lit; the Moon was 405,343 km away.

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

    76.5 orbits of the Sun — 71,858 million km, that is 93,468 return trips to the Moon; 27,928 rotations of Earth; with the Sun — 555 billion km around the Galactic centre, 21.4 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 106 million km away; today it is 244 million km (farther by 2.3×).

    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 June 1, 2027; Jupiter — in 2033.

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

    The vernal point has shifted 3,852″ since that day; the real constellations now sit 23.2° away from the astrologers’ “signs”.

    precession 50.29″/yr

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