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The sky on May 17, 1950 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☿–♂ 121.4°☉–♂ 117.1° ♀︎12° ☿︎21° ☉︎26° ☽︎1° ♄︎12° ♂︎23° ♃︎4°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 56.0° · sign Taurus · constellation Taurus
  • ☽︎ Moon — 61.1° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 51.8° · sign Taurus · constellation Aries
  • ♀︎ Venus — 12.9° · sign Aries · constellation Pisces
  • ♂︎ Mars — 173.1° · sign Virgo · constellation Virgo
  • ♃︎ Jupiter — 334.9° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 162.6° · sign Virgo · constellation Leo
  • ☽︎ Moon 0% 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]

    new moon, 0% lit; the Moon was 405,647 km away.

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

    76.4 orbits of the Sun — 71,788 million km, that is 93,376 return trips to the Moon; 27,900 rotations of Earth; with the Sun — 554.4 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 129 million km away; today it is 244 million km (farther by 1.9×).

    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 28, 2027; Jupiter — in 2033; a full moon exactly on this date — May 17, 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 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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