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The sky on April 19, 1964 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♀ 58.6°♃–☽ 91.9°♃–♄ 59.2° ♂︎16° ☉︎29° ♃︎1° ☿︎11° ♀︎14° ☽︎3° ♄︎2°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 29.5° · sign Aries · constellation Aries
  • ☽︎ Moon — 123.6° · sign Leo · constellation Cancer
  • ☿︎ Mercury — 41.2° · sign Taurus · constellation Aries
  • ♀︎ Venus — 74.8° · sign Gemini · constellation Taurus
  • ♂︎ Mars — 16.3° · sign Aries · constellation Pisces
  • ♃︎ Jupiter — 31.7° · sign Taurus · constellation Aries
  • ♄︎ Saturn — 332.5° · sign Pisces · constellation Aquarius
  • ☽︎ Moon 54% 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, 54% lit; the Moon was 376,239 km away.

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

    62.5 orbits of the Sun — 58,702 million km, that is 76,355 return trips to the Moon; 22,815 rotations of Earth; with the Sun — 453.4 billion km around the Galactic centre, 17.5 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 353 million km away; today it is 244 million km (closer by 1.4×).

    astronomy-engine; checked against JPL Horizons for 2026-09-14
  4. Solar cycle [ESTIMATE]

    That day fell in solar cycle 19, on the decline (96% through the cycle).

    SILSO smoothed minima
  5. When the sky repeats [EXACT]

    Mars returns to that day’s point of its orbit on March 31, 2028; Jupiter — in 2035; a full moon exactly on this date — April 19, 2038

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

    The vernal point has shifted 3,132″ since that day; the real constellations now sit 23.4° away from the astrologers’ “signs”.

    precession 50.29″/yr

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