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The sky on March 13, 2017 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–☿ 91.9° ♀︎11° ♂︎2° ☽︎3° ♃︎21° ♄︎27° ☉︎23° ☿︎29°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 353.1° · sign Pisces · constellation Pisces
  • ☽︎ Moon — 183.5° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 359.2° · sign Pisces · constellation Pisces
  • ♀︎ Venus — 11.4° · sign Aries · constellation Pisces
  • ♂︎ Mars — 32.5° · sign Taurus · constellation Aries
  • ♃︎ Jupiter — 201.3° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 267.3° · sign Sagittarius · constellation Sagittarius
  • ☽︎ Moon 99% 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]

    full moon, 99% lit; the Moon was 392,129 km away.

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

    9.6 orbits of the Sun — 8,985 million km, that is 11,687 return trips to the Moon; 3,492 rotations of Earth; with the Sun — 69.4 billion km around the Galactic centre, 2.7 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 317 million km away; today it is 246 million km (closer by 1.3×).

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

    That day fell in solar cycle 24, on the decline (75% through the cycle).

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

    Mars returns to that day’s point of its orbit on June 25, 2028; Jupiter — in 2029; 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 468″ 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/ap170313.html

    NASA APOD

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