Riho Terras was an Estonian-American mathematician renowned for his contributions to number theory, particularly for the Terras theorem related to the Collatz conjecture. Born in Tartu, Estonia, he emigrated to the United States in 1951 and earned his PhD in mathematics from the University of Illinois Urbana-Champaign in 1970. His work established significant bounds for the Collatz conjecture, asserting it holds for 'almost all' numbers. A recipient of the Milton Abramowitz award in 1965, he married fellow mathematician Audrey Terras, furthering a legacy in mathematical research.
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Age (Today)
Your next birthday is 328 days away.
Death Anniversary
Next death anniversary is 131 days away.
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Place of Birth
Time Zone - Europe/Tallinn (2:0 E)
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Meaning of the name - Riho
The exact meaning of Riho is uncertain, but it is often associated with 'abundance' or 'prosperity,' possibly stemming from the Japanese word 'ri,' meaning 'rich.'
Read Full Riho Name AnalysisJune 13, 1939 Facts
Generation Group
Riho Terras belongs to the Silent Generation group.
Place of Birth: Tartu
Place of Death: San Diego
Educated At: University of Maryland | University of Illinois at Urbana–Champaign
Occupation: mathematician
Spouses: Audrey Terras
Employers: University of Puerto Rico at Mayaguez | University of California, San Diego
Awards Received: Abramowitz Award
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 June 13, 1939
Note: Moon position is location and time sensitive.| Planet | Position (Tropical, Western) | Transits on June 13, 2026 | Secondary Progressions for June 13, 2026 |
|---|---|---|---|
| Sun | 21 Gemini 29 | 22 Gemini 25 | 14 Virgo 51 |
| Moon | 28 Aries 25 | 28 Taurus 2 | 4 Cancer 36 |
| Mercury | 28 Gemini 51 | 16 Cancer 44 | 2 Virgo 10 |
| Venus | 28 Taurus 46 | 29 Cancer 58 | 15 Virgo 32 |
| Mars | 4 Aquarius 9 | 18 Taurus 53 | 25 Capricorn 30 |
| Jupiter | 5 Aries 26 | 26 Cancer 31 | 6 Aries 10 |
| Saturn | 28 Aries 20 | 13 Aries 4 | 0 Taurus 52 |
| Uranus | 19 Taurus 48 | 2 Gemini 47 | 21 Taurus 56 |
| Neptune | 20 Virgo 35 | 4 Aries 15 | 22 Virgo 45 |
| Pluto | 29 Cancer 59 | 5 Aquarius 11 | 2 Leo 15 |
| Rahu | 6 Scorpio 13 | 3 Pisces 30 | 1 Scorpio 37 |
| Ketu | 6 Taurus 13 | 3 Virgo 30 | 1 Taurus 37 |
Chandra Kundali (Equal House, North Indian Diamond Chart)
