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The sky on July 30, 1997 — as it really was

That day the Sun stood in Cancer, while the horoscope says "Leo". The gap is 23.8° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–☽ 62.9°♄–♂ 179.2°♄–♃ 62.1°☽–♂ 117.8°♂–♃ 117.2° ♄︎20° ☽︎23° ☉︎7° ☿︎4° ♀︎8° ♂︎21° ♃︎18°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 127.4° · sign Leo · constellation Cancer
  • ☽︎ Moon — 83.3° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 154.2° · sign Virgo · constellation Leo
  • ♀︎ Venus — 158.4° · sign Virgo · constellation Leo
  • ♂︎ Mars — 201.1° · sign Libra · constellation Virgo
  • ♃︎ Jupiter — 318.3° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 20.4° · sign Aries · constellation Pisces
  • ☽︎ Moon 14% 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 crescent, 14% lit; the Moon was 390,495 km away.

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

    29.2 orbits of the Sun — 27,424 million km, that is 35,671 return trips to the Moon; 10,658 rotations of Earth; with the Sun — 211.8 billion km around the Galactic centre, 8.2 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 217 million km away; today it is 245 million km (farther by 1.1×).

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

    That day fell in solar cycle 23, right at the minimum (8% through the cycle).

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

    Mars returns to that day’s point of its orbit on September 3, 2027; Jupiter — in 2033.

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

    The vernal point has shifted 1,440″ since that day; the real constellations now sit 23.8° 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/ap970730.html

    NASA APOD

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