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Harold Jeffreys

Harold Jeffreys, English mathematician, geophysicist, and astronomer (died 1989)

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Born
April 22, 1891
Died
March 18, 1989
Zodiac sign
Taurus
Birth year
1891

About Harold Jeffreys

Sir Harold Jeffreys, FRS was a British geophysicist who made significant contributions to mathematics and statistics. His book, Theory of Probability, which was first published in 1939, played an important role in the revival of the objective Bayesian view of probability. Jeffreys became a fellow of St John's College in 1914, retaining his fellowship until his death 75 years later.

Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.

Harold Jeffreys timeline

  1. Jeffreys became a fellow of St John's College in 1914, retaining his fellowship until his death 75 years later.
  2. His book, Theory of Probability, which was first published in 1939, played an important role in the revival of the objective Bayesian view of probability.

The world when Harold Jeffreys was born

Harold Jeffreys was born in 1891. The year snapshot below places that birthday in its cultural and historical setting: the music and films people were following, the headlines shaping public life, and the everyday prices families encountered.

Headlines and milestones

  • Major sports momentBasketball invented in Springfield, Massachusetts
  • Top headlineFirst basketball game played (invented by Naismith)
  • Technology milestoneBasketball invented
  • World population~1.51B

United States snapshot

  • U.S. leaderBenjamin Harrison
  • U.S. population64.0M

1891 versus 2026

These figures put everyday life in Harold Jeffreys's birth year beside the site's latest United States snapshot.

Measure18912026
Population64.0M341 million

Sources and editorial standards

This profile combines a biographical source with structured birthday and historical context. Sources recorded for this profile: Wikipedia, Encyclopaedia Britannica, Library of Congress, Wikidata. See our editorial policy for sourcing, corrections, and review standards.

Read the source biography on Wikipedia. Wikipedia text is available under the Creative Commons Attribution-ShareAlike License.