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The sky on September 20, 1993 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♀–☽ 89.6°☉–☽ 60.8°♂–♄ 119.2° ♀︎28° ☉︎27° ☿︎14° ♃︎19° ♂︎25° ☽︎28° ♄︎24°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 177.5° · sign Virgo · constellation Virgo
  • ☽︎ Moon — 238.3° · sign Scorpio · constellation Scorpius
  • ☿︎ Mercury — 194.6° · sign Libra · constellation Virgo
  • ♀︎ Venus — 148.7° · sign Leo · constellation Leo
  • ♂︎ Mars — 205.6° · sign Libra · constellation Virgo
  • ♃︎ Jupiter — 199.1° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 324.8° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 26% 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]

    waxing crescent, 26% lit; the Moon was 369,897 km away.

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

    33 orbits of the Sun — 31,054 million km, that is 40,393 return trips to the Moon; 12,069 rotations of Earth; with the Sun — 239.8 billion km around the Galactic centre, 9.3 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 356 million km away; today it is 243 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 22, on the decline (71% 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 2029; a full moon exactly on this date — September 20, 2051

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

    The vernal point has shifted 1,656″ since that day; the real constellations now sit 23.8° away from the astrologers’ “signs”.

    precession 50.29″/yr

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