Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/17/2021   22:45:56   (   0.04,-137.21) (  -0.14,-137.97)   87.01                80
 03/18/2021   22:29:38   (   0.04,-137.21) (   0.88,-133.38)  435.52                80
 03/20/2021   10:51:07   (  -0.04,-137.20) (   0.28,-138.56)  155.83                80
 03/21/2021   10:29:29   (  -0.04,-137.19) (  -0.74,-133.97)  366.12                80
 03/22/2021   22:51:06   (   0.03,-137.18) (  -0.40,-139.19)  229.67                80
 03/23/2021   22:34:49   (   0.03,-137.16) (   0.62,-134.61)  291.97                80
 03/25/2021   10:56:16   (  -0.02,-137.14) (   0.60,-139.77)  300.60                80
 03/26/2021   10:34:40   (  -0.02,-137.13) (  -0.47,-135.20)  220.61                80
 03/27/2021   22:56:16   (   0.01,-137.10) (  -0.71,-140.41)  376.30                80
 03/28/2021   22:39:59   (   0.01,-137.08) (   0.31,-135.82)  144.57                80