Leigh M. Van Valen (August 12, 1935 - October 16, 2010) was an American evolutionary biologist known for his contributions to taxonomy and evolutionary theory. He proposed the Red Queen hypothesis in 1973, complementing his law of extinction, which concerned the constant probability of extinction among closely related families of organisms. He defined the Ecological Species Concept in 1976 and suggested in 1991 that HeLa cells be defined as a new species called Helacyton gartleri. Van Valen was a professor at the University of Chicago's Department of Ecology and Evolution.
Zodiac Sign (Western)
Sunsign, Tropical Zodiac
Zodiac Sign (Vedic)
Moonsign, Sidereal Zodiac
Age (Today)
Your next birthday is 47 days away.
Death Anniversary
Next death anniversary is 112 days away.
Death Date
Place of Birth
Time Zone - America/New_York (4:0 W)
Chinese Zodiac Sign
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Name Number (Chaldean)
Name Number (Pythagorean)
Meaning of the name - Leigh
meadow, clearing in a forest
Read Full Leigh Name AnalysisAugust 12, 1935 Facts
Generation Group
Leigh Van Valen belongs to the Silent Generation group.
Place of Birth: Albany
Place of Death: Chicago
Cause of Death: leukemia
Occupation: biologist
Employers: University of Chicago
Astrology Analysis
Note: This birth chart is calculated using the date and place of birth, with the time set to noon (12:00 PM) local time. While this provides accurate planetary positions for most celestial bodies, the Ascendant (Rising Sign) and house cusps are not calculated since they require precise birth time. For a complete astrological analysis including houses and rising sign, please provide the exact birth time.
Ephemeris for August 12, 1935
Note: Moon position is location and time sensitive.| Planet | Position (Tropical, Western) | Transits on August 12, 2024 | Secondary Progressions for August 12, 2024 |
|---|---|---|---|
| Sun | 19 Leo 0 | 20 Leo 26 | 16 Scorpio 19 |
| Moon | 23 Capricorn 3 | 20 Scorpio 38 | 3 Taurus 26 |
| Mercury | 21 Leo 48 | 1 Virgo 39 | 29 Libra 26 |
| Venus | 22 Virgo 13 | 9 Virgo 18 | 29 Virgo 58 |
| Mars | 7 Scorpio 52 | 15 Gemini 23 | 8 Capricorn 54 |
| Jupiter | 14 Scorpio 41 | 16 Gemini 21 | 29 Scorpio 56 |
| Saturn | 8 Pisces 20 | 17 Pisces 51 | 3 Pisces 39 |
| Uranus | 5 Taurus 31 | 27 Taurus 7 | 2 Taurus 59 |
| Neptune | 13 Virgo 22 | 29 Pisces 29 | 16 Virgo 19 |
| Pluto | 26 Cancer 16 | 0 Aquarius 23 | 27 Cancer 22 |
| Rahu | 20 Capricorn 24 | 8 Aries 58 | 15 Capricorn 41 |
| Ketu | 20 Cancer 24 | 8 Libra 58 | 15 Cancer 41 |
Chandra Kundali (Equal House, North Indian Diamond Chart)
