2010 – STS 130 Endevour – Landing at the Kennedy Space Center’s Shuttle Landing Facility occurred at 03:22:10 UTC (21 February, 22:22:10 EST).

2007 – Cassini passed by Titan, a moon of Saturn, at an altitude of 1000 kilometers for the Titan 25 flyby.

1995 –  5:00am (MST) Near-Earth Asteroid 1995CR, classified as an Aten-class asteroid and PHA (Potentially Hazardous Asteroid), approaches within 4.5 million miles of Earth.

1978 – Navstar 1 launched. It was a technological first as part of the “Block I” series of the first GPS satellites for the military. It carried multiple precise and powerful clocks and transmitters.

Birthdays

1824 – Pierre Jules César Janssen  was a French astronomer  who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere (d. 23 December 1907)