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The sky on March 31, 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 ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☉–♃ 122.2°♂–☽ 117.1° ☿︎0° ☉︎10° ♂︎29° ♀︎16° ♃︎12° ☽︎26° ♄︎4°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 10.5° · sign Aries · constellation Pisces
  • ☽︎ Moon — 146.9° · sign Leo · constellation Leo
  • ☿︎ Mercury — 0.8° · sign Aries · constellation Pisces
  • ♀︎ Venus — 46.9° · sign Taurus · constellation Aries
  • ♂︎ Mars — 29.9° · sign Aries · constellation Aries
  • ♃︎ Jupiter — 132.7° · sign Leo · constellation Cancer
  • ♄︎ Saturn — 244.7° · sign Sagittarius · constellation Scorpius
  • ☽︎ Moon 86% 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, 86% lit; the Moon was 405,519 km away.

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

    11.5 orbits of the Sun — 10,822 million km, that is 14,076 return trips to the Moon; 4,206 rotations of Earth; with the Sun — 83.6 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 353 million km away; today it is 244 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 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 May 30, 2028; Jupiter — in 2027; a full moon exactly on this date — March 31, 2037

    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/ap150331.html

    NASA APOD

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