The low-orbit satellites for another two planets to aid in weather forecasting, by the first past the Suns in the morning and one in the afternoon orbit over time is to receive the data at least every 6 hours, low-orbit satellites, there are several types of measuring instruments and devices, namely photography, high resolution (AVHRR Advanced Very High Resolution Radiometer-), which are shot with a point size 1.1 km, 6 channels, and sends a signal back to Earth with a 1700 MHz radio wave frequency, which is called the HRPT Additionally ยงัส่งภาพ low resolution image with a 4 point total with 2 channel 137 MHz frequency. Which country is called United States there are also APT Satellite Group for scientific trials and the survey environment, such as the Terra, Aqua, etc.
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