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The sky on March 21, 2021 — as it really was

That day the Sun stood in Pisces, while the horoscope says "Aries". The gap is 24.2° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☉–☽ 88.8°♂–♄ 119.7°♂–☿ 92.4°☽–♀ 90.0° ☉︎1° ♂︎10° ☽︎29° ♄︎10° ♃︎21° ☿︎7° ♀︎29°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 1.1° · sign Aries · constellation Pisces
  • ☽︎ Moon — 89.9° · sign Gemini · constellation Gemini
  • ☿︎ Mercury — 337.8° · sign Pisces · constellation Aquarius
  • ♀︎ Venus — 359.9° · sign Pisces · constellation Pisces
  • ♂︎ Mars — 70.2° · sign Gemini · constellation Taurus
  • ♃︎ Jupiter — 321.1° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 310.5° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 49% 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]

    first quarter, 49% lit; the Moon was 398,913 km away.

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

    5.5 orbits of the Sun — 5,205 million km, that is 6,771 return trips to the Moon; 2,023 rotations of Earth; with the Sun — 40.2 billion km around the Galactic centre, 1.6 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 249 million km away; today it is 245 million km (closer by 1×).

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

    That day fell in solar cycle 25, right at the minimum (12% through the cycle).

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

    Mars returns to that day’s point of its orbit on November 11, 2026; Jupiter — in 2033; a full moon exactly on this date — March 21, 2038

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

    The vernal point has shifted 252″ since that day; the real constellations now sit 24.2° 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/ap210321.html

    NASA APOD

Other dates

2021-03-20 2021-03-22 everyone born March 21
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