Paris Meridian Survey Begins
Jean Picard and fellow French investigators pursued geodetic work connected with mapping the kingdom and determining a meridian.
Historical biography archive · Updated 2026-11-03
Jean Picard Biography and Timeline
Follow Jean Picard through 4 dated historical records for France.
Jean Picard, historical timeline
A chronological timeline drawn from matching World History Database records.
4Distinct records
1 of 1Page
1667–1671Years on this page
1667
1669
Picard Undertakes Degree Measurement
Jean Picard measured an arc of meridian in France using instruments and triangulation methods of exceptional precision.
1671
Earth Meridian Measurement
Completes a precise meridian-arc measurement north of Paris.
Size of the Earth
Calculates Earths size with unprecedented seventeenth-century accuracy.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.