Solar Monochromatic Imaging
Enables detailed mapping of solar gases and active regions.
Historical biography archive · Updated 2026-11-03
Henri Alexandre Deslandres Biography and Timeline
Follow Henri Alexandre Deslandres through 2 dated historical records for France.
Henri Alexandre Deslandres, historical timeline
A chronological timeline drawn from matching World History Database records.
2Distinct records
1 of 1Page
1892–1892Years on this page
1892
Spectroheliograph
Develops an instrument for photographing the Sun at selected wavelengths.
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.