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The sky on March 13, 2009 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♀–♃ 59.1° ♀︎14° ♄︎18° ☽︎23° ♃︎15° ♂︎28° ☿︎7° ☉︎23°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 353.0° · sign Pisces · constellation Pisces
  • ☽︎ Moon — 203.2° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 337.7° · sign Pisces · constellation Aquarius
  • ♀︎ Venus — 14.5° · sign Aries · constellation Pisces
  • ♂︎ Mars — 328.7° · sign Aquarius · constellation Aquarius
  • ♃︎ Jupiter — 315.4° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 168.0° · sign Virgo · constellation Leo
  • ☽︎ Moon 93% 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, 93% lit; the Moon was 384,500 km away.

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

    17.6 orbits of the Sun — 16,504 million km, that is 21,467 return trips to the Moon; 6,414 rotations of Earth; with the Sun — 127.5 billion km around the Galactic centre, 4.9 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 335 million km away; today it is 245 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, right at the minimum (3% through the cycle).

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

    Mars returns to that day’s point of its orbit on January 3, 2028; Jupiter — in 2033; 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 864″ 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/ap090313.html

    NASA APOD

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