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Alastair Denniston

British cryptographer and Royal Navy Commander (1881-1961)

Knowledge panel

Occupation

British cryptographer and Royal Navy Commander (1881-1961)

Born in

Greenock

Born

December 1, 1881

Zodiac

Sagittarius

28,886

days lived

79

age at death

Born
December 1, 1881 in 🇬🇧Greenock
Died
January 1, 1961 in Lymington (aged 79)
Zodiac
♐︎Sagittarius·snake 🐍
Updated Jul 2026

Birth Chart

Natal Chart

Alastair's Birth Chart

Astrology
♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎☉☽☿♀♂♃♄⛢♆♇
Fire
Earth
Air
Water
☉

Sun Sign

Sagittarius♐︎

☽

Moon Sign

Aries♈︎

Dominant Element

Fire

⚠️ Rising sign requires birth time for accurate calculation

Planetary positions calculated for December 1, 1881

Day Lookup ToolDay MilestonesOn This Day
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⚡ Timeline
1961
Day 28,885
Age 79

Death

Confidence
96%
Jan 1, 1961

Alastair Denniston dies in 1961.

1919
Day 13,544
Age 37

Joins Government Code and Cypher School (GC&CS)

Confidence
92%
Jan 1, 1919
1918
Day 13,179
Age 36

Forms a codebreaking team

Confidence
96%
Jan 1, 1918

Forms a codebreaking team with William Clarke and Nigel de Grey.

1917
Day 12,814
Age 35

Works in Room 40

Confidence
92%
Jan 1, 1917
1914
Day 11,718
Age 32

Commissioned as a Commander

Confidence
96%
Jan 1, 1914

Commissioned as a Commander in the Royal Navy.

1903
Day 7,700
Age 21

Joins the Royal Navy

Confidence
96%
Jan 1, 1903

Joins the Royal Navy.

1900
Day 6,605
Age 18

Studies at University

Confidence
96%
Jan 1, 1900

Attends university, studies languages.

1881
Day 0
Age 0

Born

Confidence
96%
Dec 1, 1881

Alastair Denniston is born.