Jacobus Klaas Hammer, known as Ko Hammer, was a Dutch Esperantist born on June 12, 1928, and died on June 5, 2011, just shy of 83 years old. He and his wife Tiny were central figures in the Esperanto community in Zaanstad. Hammer was active in the Scouting Esperanto League at a young age and was involved in the creation of its publications. He served as the editor of FEN-X, a membership magazine born from the merger of several Esperanto associations, for 15 years, emphasizing a temporary role to allow for a more competent successor.
Zodiac Sign (Western)
Sunsign, Tropical Zodiac
Zodiac Sign (Vedic)
Moonsign, Sidereal Zodiac
Age (Today)
Your next birthday is 261 days away.
Death Anniversary
Next death anniversary is 110 days away.
Death Date
Place of Birth
Time Zone -
Chinese Zodiac Sign
Birth Number
Life Path Number
Name Number (Chaldean)
Name Number (Pythagorean)
Meaning of the name - Jacobus
supplanter, he who follows after
Read Full Jacobus Name AnalysisJune 12, 1928 Facts
Generation Group
Jacobus Klaas Hammer belongs to the Silent Generation group.
Occupation: Esperantist
Spouses: Tiny
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 12, 1928
Note: Moon position is location and time sensitive.Planet | Position (Tropical, Western) | Transits on June 12, 2025 | Secondary Progressions for June 12, 2025 |
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Sun | 21 Gemini 26 | 21 Gemini 58 | 24 Virgo 32 |
Moon | 10 Aries 18 | 7 Capricorn 55 | 6 Scorpio 35 |
Mercury | 11 Cancer 54 | 7 Cancer 22 | 17 Libra 43 |
Venus | 16 Gemini 16 | 6 Taurus 35 | 15 Libra 44 |
Mars | 20 Aries 3 | 27 Leo 25 | 22 Gemini 54 |
Jupiter | 1 Taurus 40 | 0 Cancer 39 | 9 Taurus 48 |
Saturn | 15 Sagittarius 49 | 1 Aries 3 | 13 Sagittarius 41 |
Uranus | 7 Aries 1 | 28 Taurus 47 | 5 Aries 50 |
Neptune | 26 Leo 45 | 2 Aries 2 | 29 Leo 53 |
Pluto | 16 Cancer 1 | 3 Aquarius 28 | 18 Cancer 12 |
Rahu | 8 Gemini 58 | 22 Pisces 52 | 3 Gemini 50 |
Ketu | 8 Sagittarius 58 | 22 Virgo 52 | 3 Sagittarius 50 |
Chandra Kundali (Equal House, North Indian Diamond Chart)
