In 1969, our indigenously built rocket Rohini-75 was successfully launched. The first Indian satellite, Aryabhatta, was launched in 1975 with help from the Soviet Union. India launched remote sensing experimental satellite Bhaskara-I from the Soviet Union in 1979. Then the first completely indigenously built satellite by ISRO in India, APPLE, was launched on 19 June 1981. In August 1983, the satellite INSAT 1-B was launched.