Carl Lampland kept a daily diary for most of his career at Lowell Observatory. The Observatory's archives houses 43 diaries, dating from 1904 to 1949. Lampland wrote about the weather, astronomy, research projects, Flagstaff news and activities, and international events.
Notable entries include Percival Lowell's death (November 12, 1916), Armistice Day (November 11, 1918), Pluto's discovery (February 18, 1930), the start of World War II (September 1, 1939), the bombing of Pearl Harbor (December 7, 1941), and President Franklin D. Roosevelt's death (April 12, 1945).
The digitized diaries are available as PDF files on our Collections page.