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The sky on March 31, 2013 — as it really was

That day the Sun stood in Pisces, while the horoscope says "Aries". The gap is 24.0° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☉–♃ 60.8°♀–♃ 60.1°♃–☿ 88.6°♄–☿ 123.0° ☉︎10° ♀︎11° ♂︎14° ♃︎11° ♄︎10° ☽︎5° ☿︎13°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 10.9° · sign Aries · constellation Pisces
  • ☽︎ Moon — 245.2° · sign Sagittarius · constellation Scorpius
  • ☿︎ Mercury — 343.1° · sign Pisces · constellation Aquarius
  • ♀︎ Venus — 11.6° · sign Aries · constellation Pisces
  • ♂︎ Mars — 14.8° · sign Aries · constellation Pisces
  • ♃︎ Jupiter — 71.8° · sign Gemini · constellation Taurus
  • ♄︎ Saturn — 220.2° · sign Scorpio · constellation Libra
  • ☽︎ Moon 79% 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]

    waning gibbous, 79% lit; the Moon was 367,546 km away.

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

    13.5 orbits of the Sun — 12,701 million km, that is 16,521 return trips to the Moon; 4,936 rotations of Earth; with the Sun — 98.1 billion km around the Galactic centre, 3.8 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 244 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 rise to maximum (39% through the cycle).

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

    Mars returns to that day’s point of its orbit on April 17, 2028; Jupiter — in 2037; 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 684″ since that day; the real constellations now sit 24° 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/ap130331.html

    NASA APOD

Other dates

2013-03-30 2013-04-01 everyone born March 31
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