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The sky on October 20, 2002 — as it really was

That day the Sun stood in Virgo, while the horoscope says "Libra". The gap is 23.9° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–☉ 117.9°♃–♀ 88.7° ☽︎18° ♄︎29° ♃︎15° ♂︎3° ☿︎11° ☉︎26° ♀︎13°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 206.9° · sign Libra · constellation Virgo
  • ☽︎ Moon — 18.2° · sign Aries · constellation Pisces
  • ☿︎ Mercury — 191.3° · sign Libra · constellation Virgo
  • ♀︎ Venus — 223.7° · sign Scorpio · constellation Libra
  • ♂︎ Mars — 183.0° · sign Libra · constellation Virgo
  • ♃︎ Jupiter — 135.0° · sign Leo · constellation Cancer
  • ♄︎ Saturn — 89.0° · sign Gemini · constellation Orion
  • ☽︎ Moon 99% 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]

    full moon, 99% lit; the Moon was 406,315 km away.

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

    24 orbits of the Sun — 22,514 million km, that is 29,285 return trips to the Moon; 8,750 rotations of Earth; with the Sun — 173.9 billion km around the Galactic centre, 6.7 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 377 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 23, near maximum (50% through the cycle).

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

    Mars returns to that day’s point of its orbit on April 3, 2027; Jupiter — in 2038; a full moon exactly on this date — October 20, 2040

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

    The vernal point has shifted 1,188″ since that day; the real constellations now sit 23.9° away from the astrologers’ “signs”.

    precession 50.29″/yr
  7. Picture of the day [EXACT]

    NASA Astronomy Picture of the Day for this date: apod.nasa.gov/apod/ap021020.html

    NASA APOD

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