The sky on July 21, 1939 — as it really was
That day the Sun stood in Cancer — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 117.8° · sign Cancer · constellation Cancer
- ☽︎ Moon — 182.3° · sign Libra · constellation Virgo
- ☿︎ Mercury — 142.6° · sign Leo · constellation Leo
- ♀︎ Venus — 105.2° · sign Cancer · constellation Gemini
- ♂︎ Mars — 300.1° · sign Aquarius · constellation Capricornus
- ♃︎ Jupiter — 8.7° · sign Aries · constellation Cetus
- ♄︎ Saturn — 30.8° · sign Taurus · constellation Pisces
- ☽︎ Moon 29% 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.
- The Moon that day [EXACT]
waxing crescent, 29% lit; the Moon was 368,574 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
87.2 orbits of the Sun — 81,955 million km, that is 106,601 return trips to the Moon; 31,852 rotations of Earth; with the Sun — 633 billion km around the Galactic centre, 24.4 light-days.
29.78 km/s along the orbit; 230 km/s around the Galactic centre - Mars then and now [EXACT]
On that day Mars was 58 million km away; today it is 246 million km (farther by 4.2×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on December 14, 2027; Jupiter — in 2034.
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 4,392″ since that day; the real constellations now sit 23° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.