Real natal chart: July 21
On July 21 the traditional sign and the Sun's real constellation coincide — both “Cancer”. That's rare.
Your real chart
- Horoscope sign (tropical): Cancer
- Your true sign (Sun's constellation): Cancer
- How far the sky has shifted: ~24.2°
Computed from the Sun's real position at noon UTC on this date (constellation boundaries: IAU). Birth year barely matters: over decades the Sun on this date moves less than a degree.
Ordinary astrology uses a zodiac fixed ~2000 years ago. Since then the sky has shifted by 24.2° (axial precession). Real, sidereal astrology looks at where the Sun and stars are now — so your true sign is Cancer, not Cancer.
The sky on July 21: numbers that do not depend on the year
- The Sun sits in Cancer from July 21 to August 10 — 21 days; its ecliptic longitude is 119.2°.
- Solar declination 20.3°: days are longer than nights in the northern hemisphere.
- Earth is 151.99 million km from the Sun (1.016 AU), moving at 29.30 km/s — slower than average, near aphelion.
- Meteor showers active today: Southern delta Aquariids (peak July 30, ZHR 25); Perseids (peak August 12, ZHR 100).
Ephemerides: astronomy-engine (VSOP87, checked against JPL Horizons); meteor showers: IMO working list.
FAQ
What is my true sign if I was born on July 21?
By the Sun's real position your sign is Cancer. Horoscopes say “Cancer”, but the sky has shifted by ~24.2° over two thousand years.
Why don't the horoscope sign and the true sign match?
The horoscope zodiac was fixed about 2000 years ago. Axial precession moved the constellations by about 24.2°, so today the Sun no longer stands where the horoscope says.
When does the Sun enter and leave Cancer?
In the reference year the Sun enters Cancer on July 21 and leaves on August 10 — 21 days. Constellation boundaries are the IAU 1930 ones and are unequal, so the “signs” differ in length.
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