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The sky on June 21, 1950 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☿–☽ 88.4°☿–♃ 92.2°☽–♃ 179.4° ♀︎23° ☿︎9° ☉︎29° ☽︎7° ♄︎13° ♂︎3° ♃︎7°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 89.5° · sign Gemini · constellation Gemini
  • ☽︎ Moon — 158.0° · sign Virgo · constellation Leo
  • ☿︎ Mercury — 69.6° · sign Gemini · constellation Taurus
  • ♀︎ Venus — 53.0° · sign Taurus · constellation Taurus
  • ♂︎ Mars — 183.8° · sign Libra · constellation Virgo
  • ♃︎ Jupiter — 337.4° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 163.7° · sign Virgo · constellation Leo
  • ☽︎ Moon 32% 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, 32% lit; the Moon was 381,621 km away.

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

    76.3 orbits of the Sun — 71,694 million km, that is 93,254 return trips to the Moon; 27,864 rotations of Earth; with the Sun — 553.7 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 167 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 August 2, 2027; Jupiter — in 2033; a full moon exactly on this date — June 20, 2035

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

    The vernal point has shifted 3,816″ since that day; the real constellations now sit 23.2° away from the astrologers’ “signs”.

    precession 50.29″/yr

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