Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/11/2021   11:04:48   (  -0.01,-137.19) (   0.97,-141.53)  494.29                80
 05/12/2021   10:43:10   (  -0.02,-137.19) (  -0.06,-136.94)   28.12                80
 05/14/2021   22:45:49   (   0.01,-137.17) (  -0.06,-137.57)   44.89                80
 05/15/2021   22:26:51   (   0.01,-137.16) (   0.98,-132.98)  476.97                80
 05/17/2021   10:50:59   (  -0.01,-137.14) (   0.22,-138.15)  115.26                80
 05/18/2021   10:29:21   (  -0.01,-137.12) (  -0.82,-133.56)  406.13                80
 05/19/2021   22:50:57   (   0.01,-137.10) (  -0.39,-138.76)  190.41                80
 05/20/2021   22:34:39   (   0.01,-137.08) (   0.65,-134.18)  330.77                80
 05/22/2021   10:56:06   (  -0.00,-137.05) (   0.54,-139.35)  262.38                80
 05/23/2021   10:34:29   (  -0.00,-137.03) (  -0.50,-134.76)  258.37                80