John Malcolm Hirst was a British aerobiologist born on April 20, 1921, in Marston Green. He is best known for inventing the Hirst spore trap, a significant advancement that allowed for the accurate monitoring of spore and pollen concentrations in the atmosphere. This invention played a crucial role in understanding plant disease epidemics, identifying airborne allergens, and providing pollen danger alerts, which greatly benefited individuals with allergic rhinitis. Following its introduction, many hospitals adopted the use of the spore trap for routine analysis.
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Moonsign, Sidereal Zodiac
Age (Today)
Your next birthday is 272 days away.
Death Anniversary
Next death anniversary is 161 days away.
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Meaning of the name - John
God is gracious
Read Full John Name AnalysisApril 20, 1921 Facts
Generation Group
John Malcolm Hirst belongs to the GI Generation group.
Place of Birth: Marston Green
Occupation: biologist
Employers: Long Ashton Research Station
Awards Received: Distinguished Service Cross
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 April 20, 1921
Note: Moon position is location and time sensitive.| Planet | Position (Tropical, Western) | Transits on April 20, 2026 | Secondary Progressions for April 20, 2026 |
|---|---|---|---|
| Sun | 0 Taurus 3 | 0 Taurus 37 | 10 Leo 47 |
| Moon | 9 Libra 35 | 15 Gemini 17 | 8 Leo 44 |
| Mercury | 10 Aries 33 | 8 Aries 18 | 22 Cancer 34 |
| Venus | 3 Taurus 18 | 25 Taurus 47 | 27 Gemini 54 |
| Mars | 19 Taurus 8 | 8 Aries 27 | 0 Leo 9 |
| Jupiter | 9 Virgo 0 | 17 Cancer 36 | 18 Virgo 42 |
| Saturn | 19 Virgo 29 | 7 Aries 51 | 22 Virgo 54 |
| Uranus | 8 Pisces 27 | 29 Taurus 44 | 8 Pisces 41 |
| Neptune | 10 Leo 57 | 2 Aries 55 | 13 Leo 22 |
| Pluto | 6 Cancer 58 | 5 Aquarius 27 | 9 Cancer 13 |
| Rahu | 27 Libra 11 | 6 Pisces 21 | 21 Libra 37 |
| Ketu | 27 Aries 11 | 6 Virgo 21 | 21 Aries 37 |
Chandra Kundali (Equal House, North Indian Diamond Chart)
