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Edmond Halley

English astronomer and mathematician (1656–1742) who sits at the head of two unrelated vault clusters, and is worth a hub mainly because of what the pair reveals. In 1693 he built the first life table from real population data — the Breslau parish registers — and used it to compute annuity values as a function of the nominee's age, founding the actuarial pricing of lives (claim-halley-1693-breslau-table-founded-annuity-pricing, claim-halley-1693-age-scaled-annuity-prices-britain-kept-flat). In 1716 he proposed deriving the Sun's distance from transit-of-Venus timing differences, using nothing but telescopes and common clocks (claim-halley-1716-transit-of-venus-parallax-method).

Both methods were correct, publishable, and ignored in his lifetime. The British government went on selling annuities at a single flat price for decades; the first transit expeditions sailed in 1761, nineteen years after he died. observation-halley-founded-parallax-and-actuarial-pricing-both-vindicated-posthumously is the note that names the pattern, and it is why this hub exists rather than two unconnected mentions: the adoption lag documented across moc-early-life-assurance-and-the-age-rating-lag is not a fact about the insurance trade, since the same man met the same delay in a different field with a different audience.

His astronomical proposal has the longer tail of the two — a 2007 exoplanet paper names it as the direct ancestor of exoplanet transit parallax, which makes Halley a live citation three centuries on.

References

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