Io Eclipse Timings
Studies timing differences in Io eclipses caused by Earth's motion.
Role range: 1644-1710
Historical biography archive · Updated 2026-11-03
Ole Christensen Romer Biography and Timeline
Follow Ole Christensen Romer through 4 dated historical records for Denmark.
Ole Christensen Romer, historical timeline
A chronological timeline drawn from matching World History Database records.
4Distinct records
1 of 1Page
1675–1700Years on this page
1675
1676
Speed of Light
Uses eclipses of Io to estimate that light travels at finite speed.
Role range: 1644-1710
1700
Danish Calendar Reform
Aligns Danish civil dating more closely with most of western Europe.
Gregorian Calendar Introduced
Helps introduce the Gregorian calendar in Denmark-Norway.
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.