Johannes Fransiscus (Joop) den Tonkelaar was a renowned Dutch meteorologist and television pioneer born on January 4, 1926, in Leiden. He was known as 'de Arm' due to his distinctive appearance on screen where only his arm and a weather map were visible. He was a pacifist during World War II and had a keen interest in meteorology, which led him to publish a significant work entitled 'Middelen en Mogelijkheden der Meteorologie' in 1955, exploring weather forecasting and atmospheric science.
Zodiac Sign (Western)
Sunsign, Tropical Zodiac
Zodiac Sign (Vedic)
Moonsign, Sidereal Zodiac
Age (Today)
Your next birthday is 210 days away.
Death Anniversary
Next death anniversary is 172 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 - Joop
God is gracious
Read Full Joop Name AnalysisJanuary 4, 1926 Facts
Generation Group
Joop den Tonkelaar belongs to the GI Generation group.
Place of Birth: Leiden, Netherlands
Place of Death: Utrecht, Netherlands
Educated At: Leiden University
Occupation: meteorologist | weather presenter
Employers: Leiden University | Schiphol International Airport
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 January 4, 1926
Note: Moon position is location and time sensitive.| Planet | Position (Tropical, Western) | Transits on January 4, 2026 | Secondary Progressions for January 4, 2026 |
|---|---|---|---|
| Sun | 13 Capricorn 36 | 14 Capricorn 21 | 23 Aries 59 |
| Moon | 14 Virgo 31 | 1 Leo 55 | 22 Taurus 28 |
| Mercury | 21 Sagittarius 29 | 4 Capricorn 21 | 2 Aries 35 |
| Venus | 22 Aquarius 50 | 13 Capricorn 52 | 7 Pisces 47 |
| Mars | 5 Sagittarius 17 | 15 Capricorn 32 | 16 Aquarius 16 |
| Jupiter | 29 Capricorn 35 | 20 Cancer 52 | 21 Aquarius 24 |
| Saturn | 23 Scorpio 37 | 26 Pisces 18 | 25 Scorpio 21 |
| Uranus | 22 Pisces 3 | 27 Taurus 51 | 27 Pisces 2 |
| Neptune | 24 Leo 23 | 29 Pisces 33 | 22 Leo 5 |
| Pluto | 13 Cancer 40 | 2 Aquarius 50 | 12 Cancer 39 |
| Rahu | 26 Cancer 6 | 11 Pisces 58 | 20 Cancer 48 |
| Ketu | 26 Capricorn 6 | 11 Virgo 58 | 20 Capricorn 48 |
Chandra Kundali (Equal House, North Indian Diamond Chart)
