Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2021   22:05:14   (  -0.36,-127.70) (   0.06,-125.77)  220.41                80
 09/27/2021   10:24:01   (   0.33,-127.67) (   1.07,-130.94)  372.95                80
 09/28/2021   10:07:42   (   0.34,-127.63) (   0.06,-126.35)  146.36                80
 09/29/2021   22:26:38   (  -0.32,-127.54) (  -1.24,-131.55)  457.49                80
 09/30/2021   22:10:19   (  -0.32,-127.50) (  -0.23,-126.96)   61.39                80
 10/03/2021   10:10:08   (   0.31,-127.41) (   0.34,-127.54)   14.55                80
 10/05/2021   22:12:45   (  -0.29,-127.27) (  -0.51,-128.15)  100.37                80
 10/06/2021   21:56:26   (  -0.31,-127.22) (   0.50,-123.55)  418.07                80
 10/08/2021   10:15:14   (   0.28,-127.17) (   0.62,-128.73)  177.71                80