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The sky on October 17, 1976 — as it really was

That day the Sun stood in Virgo, while the horoscope says "Libra". The gap is 23.5° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☿ 62.6°☽–♂ 88.2° ♃︎29° ☽︎7° ♄︎15° ☿︎10° ☉︎24° ♂︎5° ♀︎26°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 204.2° · sign Libra · constellation Virgo
  • ☽︎ Moon — 127.7° · sign Leo · constellation Cancer
  • ☿︎ Mercury — 190.3° · sign Libra · constellation Virgo
  • ♀︎ Venus — 236.1° · sign Scorpio · constellation Libra
  • ♂︎ Mars — 215.9° · sign Scorpio · constellation Virgo
  • ♃︎ Jupiter — 59.9° · sign Taurus · constellation Taurus
  • ♄︎ Saturn — 135.3° · sign Leo · constellation Cancer
  • ☽︎ Moon 39% 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]

    last quarter, 39% lit; the Moon was 383,638 km away.

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

    50 orbits of the Sun — 46,959 million km, that is 61,081 return trips to the Moon; 18,251 rotations of Earth; with the Sun — 362.7 billion km around the Galactic centre, 14 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 378 million km away; today it is 244 million km (closer by 1.6×).

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

    That day fell in solar cycle 21, right at the minimum (6% through the cycle).

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

    Mars returns to that day’s point of its orbit on July 30, 2027; Jupiter — in 2035; a full moon exactly on this date — October 17, 2035

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

    The vernal point has shifted 2,484″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.

    precession 50.29″/yr

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