Cal Henderson, born on January 17, 1981, is a British computer programmer and author based in San Francisco. He is best known as the co-founder and CTO of Slack and for his role in developing the online community B3ta and the photo-sharing application Flickr. Henderson authored 'Building Scalable Web Sites' and has worked on various web projects, contributing to making technology more accessible. He is also active in open-source software and has engaged in political donations, demonstrating his wide-ranging influence in technology and community engagement.
Zodiac Sign (Western)
Sunsign, Tropical Zodiac
Zodiac Sign (Vedic)
Moonsign, Sidereal Zodiac
Age (Today)
Your next birthday is 4 days away.
Place of Birth
Time Zone -
Chinese Zodiac Sign
Birth Number
Life Path Number
Name Number (Chaldean)
Name Number (Pythagorean)
Meaning of the name - Cal
While Cal doesn't have a direct meaning, it is often associated with warmth, friendliness, and a vibrant spirit. It can also evoke a sense of simplicity and strength.
Read Full Cal Name AnalysisJanuary 17, 1981 Facts
Generation Group
Cal Henderson belongs to the Millennials group.
Educated At: Sharnbrook Academy
Occupation: blogger | engineer
Employers: Slack | B3ta | Ludicorp | Yahoo | EMAP | Tiny Speck
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 17, 1981
Note: Moon position is location and time sensitive.| Planet | Position (Tropical, Western) | Transits on January 17, 2025 | Secondary Progressions for January 17, 2025 |
|---|---|---|---|
| Sun | 27 Capricorn 31 | 27 Capricorn 50 | 12 Pisces 2 |
| Moon | 24 Gemini 9 | 12 Virgo 30 | 23 Capricorn 58 |
| Mercury | 8 Aquarius 30 | 13 Capricorn 40 | 19 Aquarius 51 |
| Venus | 8 Capricorn 2 | 14 Pisces 48 | 3 Pisces 4 |
| Mars | 14 Aquarius 0 | 25 Cancer 34 | 18 Pisces 45 |
| Jupiter | 10 Libra 9 | 11 Gemini 48 | 8 Libra 9 |
| Saturn | 10 Libra 11 | 15 Pisces 54 | 8 Libra 40 |
| Uranus | 29 Scorpio 13 | 23 Taurus 21 | 0 Sagittarius 10 |
| Neptune | 23 Sagittarius 39 | 27 Pisces 36 | 24 Sagittarius 42 |
| Pluto | 24 Libra 19 | 1 Aquarius 35 | 23 Libra 59 |
| Rahu | 11 Leo 37 | 0 Aries 36 | 9 Leo 18 |
| Ketu | 11 Aquarius 37 | 0 Libra 36 | 9 Aquarius 18 |
Chandra Kundali (Equal House, North Indian Diamond Chart)
Astrology Transits Analysis for Year 2026
Note: Multiple transits occurring in close proximity often signify a major event in a person's life.Cal Henderson's 2026 Transits to Natal Planets
- Mars conjunction Mars
Exact: 10 February, 2026 - Mars square Moon
Exact: 01 April, 2026 - Mars opposition Jupiter
Exact: 21 April, 2026 - Mars opposition Saturn
Exact: 21 April, 2026 - Saturn square Venus
Exact: 21 April, 2026 - Saturn opposition Jupiter
Exact: 11 May, 2026 - Saturn opposition Saturn
Exact: 11 May, 2026 - Jupiter opposition Sun
Exact: 20 June, 2026 - Mars aspects Venus
Exact: 10 July, 2026 - Jupiter opposition Mercury
Exact: 09 August, 2026 - Jupiter conjunction Rahu
Exact: 19 August, 2026 - Jupiter opposition Ketu
Exact: 19 August, 2026 - Mars aspects Ketu
Exact: 29 August, 2026 - Saturn opposition Jupiter
Exact: 08 October, 2026 - Saturn opposition Saturn
Exact: 08 October, 2026 - Mars conjunction Rahu
Exact: 18 October, 2026 - Mars opposition Ketu
Exact: 18 October, 2026
