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. Tiros 1 was only operational for 78 days, but proved that satellites could be useful tools for surveying weather conditions from space.

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.