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The sky on August 2, 1999 — as it really was

That day the Sun stood in Cancer, while the horoscope says "Leo". The gap is 23.9° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☉ 118.9°♃–♀ 120.7°☉–♂ 92.4° ☽︎10° ♃︎4° ♄︎16° ☿︎29° ☉︎9° ♀︎4° ♂︎12°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 129.8° · sign Leo · constellation Cancer
  • ☽︎ Moon — 10.9° · sign Aries · constellation Cetus
  • ☿︎ Mercury — 119.3° · sign Cancer · constellation Cancer
  • ♀︎ Venus — 154.9° · sign Virgo · constellation Sextans
  • ♂︎ Mars — 222.1° · sign Scorpio · constellation Libra
  • ♃︎ Jupiter — 34.2° · sign Taurus · constellation Aries
  • ♄︎ Saturn — 46.5° · sign Taurus · constellation Aries
  • ☽︎ Moon 74% 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 gibbous, 74% lit; the Moon was 376,956 km away.

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

    27.2 orbits of the Sun — 25,542 million km, that is 33,223 return trips to the Moon; 9,927 rotations of Earth; with the Sun — 197.3 billion km around the Galactic centre, 7.6 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 152 million km away; today it is 244 million km (farther by 1.6×).

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

    That day fell in solar cycle 23, on the rise to maximum (24% through the cycle).

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

    Mars returns to that day’s point of its orbit on October 19, 2027; Jupiter — in 2035; a full moon exactly on this date — August 1, 2042

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

    The vernal point has shifted 1,368″ since that day; the real constellations now sit 23.9° 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/ap990802.html

    NASA APOD

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