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The sky on September 13, 1968 — as it really was

That day the Sun stood in Leo, while the horoscope says "Virgo". The gap is 23.4° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–♂ 120.4° ♄︎24° ☽︎5° ♂︎24° ♃︎17° ☉︎20° ♀︎13° ☿︎16°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 170.7° · sign Virgo · constellation Leo
  • ☽︎ Moon — 66.0° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 196.1° · sign Libra · constellation Virgo
  • ♀︎ Venus — 193.8° · sign Libra · constellation Virgo
  • ♂︎ Mars — 144.8° · sign Leo · constellation Leo
  • ♃︎ Jupiter — 167.4° · sign Virgo · constellation Leo
  • ♄︎ Saturn — 24.4° · sign Aries · constellation Pisces
  • ☽︎ Moon 63% 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, 63% lit; the Moon was 404,230 km away.

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

    58.1 orbits of the Sun — 54,561 million km, that is 70,969 return trips to the Moon; 21,205 rotations of Earth; with the Sun — 421.4 billion km around the Galactic centre, 16.3 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 373 million km away; today it is 245 million km (closer by 1.5×).

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

    That day fell in solar cycle 20, on the rise to maximum (35% through the cycle).

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

    Mars returns to that day’s point of its orbit on January 3, 2027; Jupiter — in 2027; a full moon exactly on this date — September 13, 2057

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

    The vernal point has shifted 2,916″ since that day; the real constellations now sit 23.4° away from the astrologers’ “signs”.

    precession 50.29″/yr

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