1911Early Hertzsprung-Russell DiagramEjnar Hertzsprung
Develops an early form of the diagram later bearing his name.
Historical records for Denmark in 1911, rendered directly from the World History Database and ordered by month, day and event.
Develops an early form of the diagram later bearing his name.
Plots stellar colour against absolute brightness to reveal systematic sequences.
This page is generated from stored World History Database records matching the exact country and year shown above. Exact duplicate display records are collapsed. Records without a month are listed after the monthly sections. Source provenance varies by record; formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.