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

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☉–♃ 118.2°☽–♄ 88.2° ☿︎16° ☉︎0° ♀︎23° ♂︎6° ☽︎14° ♄︎12° ♃︎2°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 90.3° · sign Cancer · constellation Taurus
  • ☽︎ Moon — 224.6° · sign Scorpio · constellation Libra
  • ☿︎ Mercury — 76.2° · sign Gemini · constellation Taurus
  • ♀︎ Venus — 113.1° · sign Cancer · constellation Gemini
  • ♂︎ Mars — 126.1° · sign Leo · constellation Cancer
  • ♃︎ Jupiter — 332.2° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 312.9° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 85% 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]

    waxing gibbous, 85% lit; the Moon was 362,871 km away.

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

    5.3 orbits of the Sun — 4,968 million km, that is 6,463 return trips to the Moon; 1,931 rotations of Earth; with the Sun — 38.4 billion km around the Galactic centre, 1.5 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 356 million km away; today it is 246 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 25, right at the minimum (15% through the cycle).

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

    Mars returns to that day’s point of its orbit on February 11, 2027; Jupiter — in 2033; a full moon exactly on this date — June 20, 2035

    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/ap210621.html

    NASA APOD

Other dates

2021-06-20 2021-06-22 everyone born June 21
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