April 01

1960 – Tiros 1, the first successful weather satellite, is launched by the United States. Two television cameras in the satellite returned views of clouds above the Earth.
1997 – Comet Hale-Bopp is seen passing over perihelion.
2003 – A banteng (cattle) delivered in the United States is the second successful cloning of an endangered species, and the first such clone to survive beyond infancy.