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The sky on May 15, 1998 — as it really was

That day the Sun stood in Taurus — sign and constellation agree here.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♃ 61.6°☉–♃ 62.3° ♀︎13° ♄︎27° ☿︎0° ♂︎23° ☉︎24° ☽︎9° ♃︎22°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 54.5° · sign Taurus · constellation Taurus
  • ☽︎ Moon — 279.2° · sign Capricorn · constellation Sagittarius
  • ☿︎ Mercury — 30.6° · sign Taurus · constellation Pisces
  • ♀︎ Venus — 13.3° · sign Aries · constellation Pisces
  • ♂︎ Mars — 53.8° · sign Taurus · constellation Taurus
  • ♃︎ Jupiter — 352.2° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 27.3° · sign Aries · constellation Pisces
  • ☽︎ 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]

    waning gibbous, 85% lit; the Moon was 390,257 km away.

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

    28.4 orbits of the Sun — 26,682 million km, that is 34,706 return trips to the Moon; 10,370 rotations of Earth; with the Sun — 206.1 billion km around the Galactic centre, 8 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 373 million km away; today it is 244 million km (closer by 1.5×).

    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 (14% through the cycle).

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

    Mars returns to that day’s point of its orbit on June 18, 2028; Jupiter — in 2034.

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

    The vernal point has shifted 1,404″ 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/ap980515.html

    NASA APOD

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