SECOR

SECOR spacecraft are satellites used by the United States armed forces for geodesy measurements that precisely determined the locations of points on the Earth's surface. Experiments with these spacecraft led to the Timation and GPS Navstar systems.

Launch history

 * SECOR 1...January 11, 1964
 * SECOR 2...March 11, 1965
 * SECOR 3...March 4, 1965
 * SECOR 4...April 3, 1965
 * SECOR 5...August 10, 1965
 * SECOR 6...June 9, 1966
 * SECOR 7...August 19, 1966
 * SECOR 8...October 5, 1966
 * SECOR 9...June 29, 1967
 * SECOR 10..launch failed
 * SECOR 11..August 16, 1968
 * SECOR 12..August 16, 1968
 * SECOR 13..April 14, 1969

SECOR was an abbreviation for "Sequential Collation of Range".