Thor DM-21 Ablestar | Transit 1B
Launch Successful
L - -- : -- : -- : --
Instantaneous launch window.
Launch Window
April 13, 1960, 12:02 p.m. - April 13, 1960, 12:02 p.m.
Instantaneous launch window.
April 13, 1960, 12:02 p.m. - April 13, 1960, 12:02 p.m.
The Transit system was the first satellite navigation system to be used operationally. The system was primarily used by the U.S. Navy to provide accurate location information to its Polaris ballistic missile submarines, and it was also used as a navigation system by the Navy's surface ships, as well as for hydrographic survey and geodetic surveying.
The Thor-Ablestar, or Thor Able-Star, also known as Thor-Epsilon was an early American expendable launch system consisting of a PGM-17 Thor missile, with an Ablestar upper stage. It was a member of the Thor family of rockets, and was derived from the Thor-Able.
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal Corps, the USAF was established as a separate branch of the United States Armed Forces in 1947 with the enactment of the National Security Act of 1947.
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