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The sky on May 13, 2023 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☿–♀ 60.5°☿–☽ 61.6°☿–♄ 59.7°♀–☽ 122.1°♀–♄ 120.2° ♃︎29° ☿︎5° ☉︎22° ♀︎6° ♂︎25° ☽︎4° ♄︎6°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 52.5° · sign Taurus · constellation Aries
  • ☽︎ Moon — 334.3° · sign Pisces · constellation Aquarius
  • ☿︎ Mercury — 36.0° · sign Taurus · constellation Aries
  • ♀︎ Venus — 96.4° · sign Cancer · constellation Gemini
  • ♂︎ Mars — 116.0° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 29.3° · sign Aries · constellation Pisces
  • ♄︎ Saturn — 336.2° · sign Pisces · constellation Aquarius
  • ☽︎ Moon 40% 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, 40% lit; the Moon was 370,746 km away.

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

    3.4 orbits of the Sun — 3,192 million km, that is 4,151 return trips to the Moon; 1,240 rotations of Earth; with the Sun — 24.6 billion km around the Galactic centre, 1 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 277 million km away; today it is 245 million km (closer by 1.1×).

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

    That day fell in solar cycle 25, on the rise to maximum (33% through the cycle).

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

    Mars returns to that day’s point of its orbit on February 15, 2027; Jupiter — in 2035; a full moon exactly on this date — May 12, 2063

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

    The vernal point has shifted 144″ 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/ap230513.html

    NASA APOD

Other dates

2023-05-12 2023-05-14 everyone born May 13
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