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Updated Terra MODIS day/night schedule

After several months of reviewing the performance of the Terra day/night-rate schedule (originally implemented November 8, 2020) and with input from science-team users, MCST has implemented a revised day/night schedule that goes into effect May 2, 2021 (2021/122). This updated schedule improves the day-rate data coverage by using a timing variation based on sun-angle changes throughout the year.