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The sky on March 13, 2001 — as it really was

That day the Sun stood in Pisces — sign and constellation agree here.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–☿ 90.5° ♀︎17° ♄︎26° ♃︎4° ☽︎13° ♂︎13° ☿︎25° ☉︎22°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 353.0° · sign Pisces · constellation Pisces
  • ☽︎ Moon — 223.3° · sign Scorpio · constellation Libra
  • ☿︎ Mercury — 325.6° · sign Aquarius · constellation Capricornus
  • ♀︎ Venus — 17.3° · sign Aries · constellation Pisces
  • ♂︎ Mars — 253.1° · sign Sagittarius · constellation Ophiuchus
  • ♃︎ Jupiter — 64.7° · sign Gemini · constellation Taurus
  • ♄︎ Saturn — 56.1° · sign Taurus · constellation Taurus
  • ☽︎ Moon 82% 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, 82% lit; the Moon was 379,394 km away.

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

    25.6 orbits of the Sun — 24,021 million km, that is 31,245 return trips to the Moon; 9,336 rotations of Earth; with the Sun — 185.5 billion km around the Galactic centre, 7.2 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 161 million km away; today it is 246 million km (farther by 1.5×).

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

    That day fell in solar cycle 23, on the rise to maximum (37% through the cycle).

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

    Mars returns to that day’s point of its orbit on July 13, 2027; Jupiter — in 2037; a full moon exactly on this date — March 13, 2055

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

    The vernal point has shifted 1,260″ since that day; the real constellations now sit 23.9° 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/ap010313.html

    NASA APOD

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