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The sky on October 21, 2000 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☿ 91.5° ♄︎29° ♃︎10° ☽︎13° ♂︎21° ☉︎28° ☿︎15° ♀︎2°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 208.4° · sign Libra · constellation Virgo
  • ☽︎ Moon — 133.7° · sign Leo · constellation Cancer
  • ☿︎ Mercury — 225.2° · sign Scorpio · constellation Libra
  • ♀︎ Venus — 242.7° · sign Sagittarius · constellation Scorpius
  • ♂︎ Mars — 171.6° · sign Virgo · constellation Leo
  • ♃︎ Jupiter — 70.4° · sign Gemini · constellation Taurus
  • ♄︎ Saturn — 59.7° · sign Taurus · constellation Taurus
  • ☽︎ Moon 37% 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, 37% lit; the Moon was 370,700 km away.

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

    26 orbits of the Sun — 24,389 million km, that is 31,724 return trips to the Moon; 9,479 rotations of Earth; with the Sun — 188.4 billion km around the Galactic centre, 7.3 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 352 million km away; today it is 246 million km (closer by 1.4×).

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

    That day fell in solar cycle 23, on the rise to maximum (34% through the cycle).

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

    Mars returns to that day’s point of its orbit on February 20, 2027; Jupiter — in 2036; a full moon exactly on this date — October 21, 2059

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

    The vernal point has shifted 1,296″ 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/ap001021.html

    NASA APOD

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