Charles Messier1774
Messier's first published 45-object catalogue includes M21, giving comet hunters a fixed deep-sky reference under the designation M21.
France · Science / Astronomy. Chronological records rendered directly from the World History Database.
Messier's first published 45-object catalogue includes M21, giving comet hunters a fixed deep-sky reference under the designation M21.
This factsheet is generated from stored World History Database records matching the country, broad category, detailed category and exact Event value shown above. Duplicate display records are collapsed; database wording is otherwise preserved. Source provenance varies by record, so formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.