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The sky on April 13, 2015 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–☽ 88.7°♀–♄ 178.0°♃–☽ 178.1° ☉︎23° ☿︎26° ♂︎9° ♀︎2° ♃︎12° ♄︎4° ☽︎10°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 23.2° · sign Aries · constellation Pisces
  • ☽︎ Moon — 310.7° · sign Aquarius · constellation Aquarius
  • ☿︎ Mercury — 26.9° · sign Aries · constellation Pisces
  • ♀︎ Venus — 62.2° · sign Gemini · constellation Taurus
  • ♂︎ Mars — 39.4° · sign Taurus · constellation Aries
  • ♃︎ Jupiter — 132.6° · sign Leo · constellation Cancer
  • ♄︎ Saturn — 244.2° · sign Sagittarius · constellation Scorpius
  • ☽︎ 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]

    last quarter, 35% lit; the Moon was 369,937 km away.

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

    11.5 orbits of the Sun — 10,786 million km, that is 14,030 return trips to the Moon; 4,192 rotations of Earth; with the Sun — 83.3 billion km around the Galactic centre, 3.2 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 360 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, near maximum (58% through the cycle).

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

    Mars returns to that day’s point of its orbit on June 12, 2028; Jupiter — in 2027; a full moon exactly on this date — April 13, 2063

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

    The vernal point has shifted 576″ 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/ap150413.html

    NASA APOD

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