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The sky on October 30, 2017 — as it really was

That day the Sun stood in Virgo, while the horoscope says "Scorpio". The gap is 24.1° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–☽ 122.1°☉–☽ 119.2° ♂︎4° ♀︎20° ♃︎4° ☉︎7° ☿︎20° ♄︎24° ☽︎6°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 217.3° · sign Scorpio · constellation Virgo
  • ☽︎ Moon — 336.5° · sign Pisces · constellation Aquarius
  • ☿︎ Mercury — 230.7° · sign Scorpio · constellation Libra
  • ♀︎ Venus — 200.0° · sign Libra · constellation Virgo
  • ♂︎ Mars — 184.9° · sign Libra · constellation Virgo
  • ♃︎ Jupiter — 214.3° · sign Scorpio · constellation Virgo
  • ♄︎ Saturn — 264.5° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon 75% 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 gibbous, 75% lit; the Moon was 388,082 km away.

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

    8.9 orbits of the Sun — 8,391 million km, that is 10,915 return trips to the Moon; 3,261 rotations of Earth; with the Sun — 64.8 billion km around the Galactic centre, 2.5 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 361 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 24, on the decline (81% through the cycle).

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

    Mars returns to that day’s point of its orbit on March 27, 2027; Jupiter — in 2029; a full moon exactly on this date — October 30, 2031

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

    The vernal point has shifted 432″ since that day; the real constellations now sit 24.1° 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/ap171030.html

    NASA APOD

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