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EN
Helwan
Town south of Cairo whose observatory took an unnoticed plate of Halley's Comet on 24 August 1909.
Place
Identifiers
Wikidata Q771345
Appears in
1 item
Halley’s Comet Through History
1 item
Max Wolf spots the returning comet
· earlier sighting
11 Sep 1909
Sources
Book
Comets: A Chronological History of Observation, Science, Myth, and Folklore
