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The sky on January 23, 2018 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☿ 88.3°♃–☿ 57.2° ☽︎15° ♃︎20° ♂︎28° ♄︎3° ☿︎17° ☉︎3° ♀︎6°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 303.4° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon — 15.8° · sign Aries · constellation Cetus
  • ☿︎ Mercury — 287.5° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 306.8° · sign Aquarius · constellation Capricornus
  • ♂︎ Mars — 238.1° · sign Scorpio · constellation Libra
  • ♃︎ Jupiter — 230.3° · sign Scorpio · constellation Libra
  • ♄︎ Saturn — 273.9° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon 35% 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]

    first quarter, 35% lit; the Moon was 385,525 km away.

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

    8.7 orbits of the Sun — 8,173 million km, that is 10,631 return trips to the Moon; 3,176 rotations of Earth; with the Sun — 63.1 billion km around the Galactic centre, 2.4 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 262 million km away; today it is 245 million km (closer by 1.1×).

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

    That day fell in solar cycle 24, on the decline (83% through the cycle).

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

    Mars returns to that day’s point of its orbit on June 20, 2027; Jupiter — in 2030; a full moon exactly on this date — January 22, 2027

    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/ap180123.html

    NASA APOD

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