87.5°E卫星东西校正周期是45天,首次最佳瞄准日期是1988年4月21日。假定东西校正日期与周期无特殊变化,以后的最佳瞄准日期是在首次瞄准日期之上,加上若干个东西校正周期~(1)。由于首次最佳瞄准日期已过很久,月份有大有小,逐月推加,不但很麻烦,而且容易出错。我根据平年365天,含8个周期另5天,闰年366天,含8个周期另6天,用列表法推算,找出了最佳瞄准 The 87.5 ° E satellite has a 45-day correction cycle and the first best aiming date is April 21, 1988. Assuming that there is no special change between the date and period of the correction, the best later date is above the first aiming date, plus a few things to correct the period ~ (1). As the first best aiming date has passed for a long time, the month is big and small, pushing up month by month, not only troublesome but also error-prone. I based 365 days a year, including 8 cycles of another 5 days, leap year 366 days, including 8 cycles of another 6 days, calculated using the list method, to find the best aiming