History of Space Exploration: Chapter 3, Exercise 1 — Possible Solution
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EXACT DATES
4 Oct 1957 Sputnik 1 launched; 26 Oct 1957 transmitter ends; 4 Jan 1958
re-entry; 31 Jan 1958 Explorer 1; 29 Jul 1958 NASA established; 1 Oct 1958
NASA begins operations.

BY MONTH ONLY
ARPA formed February 1958. The National Defense Education Act is dated only
"within a year".