On this day, 28 years ago, on September 1, 1997 (July 30, 1997, the "Chang 2C" improved rocket was successfully launched. On September 1, 1997, the Long March 2C improved carrier rocket made in my country was launched for the first time at the Taiyuan Satellite Launch Center, successfully launching two Iridium simulation satellites made by Motorola in the United States into predetermined orbits. This is the 47th flight of the Long March series of launch vehicles. According to data from the Xi'an Satellite Monitoring and Control Center, about 11 minutes after the "Chang-2C" rocket flew, the second stage of the rocket was successfully separated from the distributor according to the predetermined design. The distributor carried the satellite into a perigee of 181.8 kilometers and an apogee of 674.7 kilometers. Kilometres of berthing orbit. After that, the distributor successfully changed orbit after more than 40 minutes of taxiing, and released the two satellites into the predetermined orbit according to the contract requirements. The entire launch test was successful. This launch is a simulated satellite launch test for the official launch of the Iridium satellite by Motorola of the United States. It is used to test the performance and quality of the improved "Chang-2C" rocket and to test the comprehensive launch capabilities of the Taiyuan Satellite Launch Center. The simulated satellite launch test was successful, and the United States is full of confidence in the official launch of the Iridium satellite. According to reports, the "Iridium" system is a new type of global satellite personal mobile communication system designed by Motorola of the United States. It deploys 66 satellites on 6 operating surfaces in low earth orbit to achieve global satellite communications. Because its distribution is close to the order of the chemical element "Iridium", it is called the "Iridium" system. According to relevant contracts, 22 of these 66 satellites were launched by launch vehicles from the United States, Russia and China. At present, the United States uses Delta rockets and Russia uses Proton rockets to launch the Iridium satellite. China Academy of Launch Vehicle Technology has developed an improved "Long-2C" launch vehicle for the "Iridium" launch. The rocket has three stages, with a total length of about 40 meters, a diameter of 3.35 meters, and a take-off mass of 213 tons. It is based on the "Chang-2C" rocket, which is mainly used to transfer the satellite from the initial berthing orbit. Send it into the final circular orbit and release the satellite. The improved rocket's carrying capacity has been increased, its structure and performance have been adjusted, and the satellite fairing technology of the Long March 3A launch vehicle has been successfully used.