Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/04/2021   10:54:33   (  -0.05,-137.22) (   0.45,-139.49)  258.93                80
 03/05/2021   10:32:55   (  -0.05,-137.21) (  -0.57,-134.90)  263.46                80
 03/06/2021   22:54:32   (   0.05,-137.21) (  -0.61,-140.12)  331.38                80
 03/07/2021   22:38:15   (   0.04,-137.20) (   0.41,-135.53)  190.74                80
 03/09/2021   10:59:43   (  -0.03,-137.19) (   0.73,-140.71)  401.24                80
 03/10/2021   10:38:06   (  -0.03,-137.18) (  -0.28,-136.12)  120.64                80
 03/11/2021   22:59:42   (   0.02,-137.17) (  -0.94,-141.33)  474.78                80
 03/12/2021   22:43:26   (   0.02,-137.16) (   0.14,-136.75)   47.17                80
 03/15/2021   10:45:55   (  -0.02,-137.13) (   0.05,-137.33)   23.99                80
 03/16/2021   10:24:19   (  -0.02,-137.12) (  -1.02,-132.76)  497.40                80
 03/17/2021   22:45:55   (   0.02,-137.10) (  -0.18,-137.97)   99.09                80