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The sky on July 16, 2017 — as it really was

That day the Sun stood in Gemini, while the horoscope says "Cancer". The gap is 24.1° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☿ 117.3°☽–♄ 117.8°♀–♃ 122.4°☿–♃ 57.7° ☽︎20° ♀︎12° ☉︎24° ♂︎27° ☿︎17° ♃︎15° ♄︎22°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 114.1° · sign Cancer · constellation Gemini
  • ☽︎ Moon — 20.2° · sign Aries · constellation Pisces
  • ☿︎ Mercury — 137.5° · sign Leo · constellation Cancer
  • ♀︎ Venus — 72.8° · sign Gemini · constellation Taurus
  • ♂︎ Mars — 117.4° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 195.2° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 262.4° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon 54% 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]

    last quarter, 54% lit; the Moon was 376,741 km away.

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

    9.2 orbits of the Sun — 8,664 million km, that is 11,269 return trips to the Moon; 3,367 rotations of Earth; with the Sun — 66.9 billion km around the Galactic centre, 2.6 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 396 million km away; today it is 245 million km (closer by 1.6×).

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

    That day fell in solar cycle 24, on the decline (78% through the cycle).

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

    Mars returns to that day’s point of its orbit on December 11, 2026; Jupiter — in 2029; a full moon exactly on this date — July 16, 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 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/ap170716.html

    NASA APOD

Other dates

2017-07-15 2017-07-17 everyone born July 16
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