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The sky on October 29, 1984 — as it really was

That day the Sun stood in Virgo, while the horoscope says "Scorpio". The gap is 23.6° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☉–♃ 62.2°♄–♂ 59.7°☿–♂ 59.2° ☉︎6° ♄︎17° ☿︎17° ♀︎11° ♃︎8° ☽︎12° ♂︎17°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 216.2° · sign Scorpio · constellation Virgo
  • ☽︎ Moon — 282.2° · sign Capricorn · constellation Sagittarius
  • ☿︎ Mercury — 228.0° · sign Scorpio · constellation Libra
  • ♀︎ Venus — 251.3° · sign Sagittarius · constellation Ophiuchus
  • ♂︎ Mars — 287.2° · sign Capricorn · constellation Sagittarius
  • ♃︎ Jupiter — 278.4° · sign Capricorn · constellation Sagittarius
  • ♄︎ Saturn — 227.5° · sign Scorpio · constellation Libra
  • ☽︎ Moon 30% 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, 30% lit; the Moon was 383,818 km away.

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

    41.9 orbits of the Sun — 39,411 million km, that is 51,263 return trips to the Moon; 15,317 rotations of Earth; with the Sun — 304.4 billion km around the Galactic centre, 11.8 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 200 million km away; today it is 243 million km (farther by 1.2×).

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

    That day fell in solar cycle 21, on the decline (82% through the cycle).

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

    Mars returns to that day’s point of its orbit on February 2, 2028; Jupiter — in 2031; a full moon exactly on this date — October 28, 2042

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

    The vernal point has shifted 2,088″ since that day; the real constellations now sit 23.7° away from the astrologers’ “signs”.

    precession 50.29″/yr

Other dates

1984-10-28 1984-10-30 everyone born October 29
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