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.
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Age (Today)
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Death Anniversary
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Time Zone - America/New_York (4:0 W)
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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
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)
