Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/12/2021   22:43:25   (   0.04,-137.21) (   0.13,-136.75)   52.68                80
 03/15/2021   10:45:56   (  -0.04,-137.20) (  -0.01,-137.34)   16.22                80
 03/17/2021   22:45:56   (   0.04,-137.19) (  -0.13,-137.97)   88.94                80
 03/18/2021   22:29:39   (   0.04,-137.18) (   0.89,-133.39)  432.91                80
 03/20/2021   10:51:07   (  -0.04,-137.16) (   0.26,-138.57)  159.90                80
 03/21/2021   10:29:29   (  -0.03,-137.15) (  -0.75,-133.98)  361.38                80
 03/22/2021   22:51:06   (   0.03,-137.13) (  -0.44,-139.19)  234.96                80
 03/23/2021   22:34:48   (   0.02,-137.11) (   0.58,-134.60)  286.01                80
 03/25/2021   10:56:16   (  -0.01,-137.07) (   0.58,-139.78)  307.98                80