Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/22/2021   22:53:47   (   0.04,-137.22) (  -0.37,-139.20)  224.66                80
 03/23/2021   22:32:09   (   0.04,-137.25) (   0.65,-134.61)  301.59                80
 03/25/2021   10:56:18   (  -0.03,-137.30) (   0.51,-139.79)  283.89                80
 03/26/2021   10:34:40   (  -0.03,-137.32) (  -0.51,-135.20)  241.86                80
 03/27/2021   22:58:56   (   0.02,-137.36) (  -0.68,-140.41)  348.02                80
 03/28/2021   22:37:20   (   0.03,-137.39) (   0.40,-135.83)  177.47                80
 03/30/2021   11:01:28   (  -0.03,-137.42) (   0.77,-141.01)  409.19                80
 03/31/2021   10:39:51   (  -0.03,-137.44) (  -0.25,-136.42)  115.64                80
 04/01/2021   23:04:07   (   0.03,-137.47) (  -0.93,-141.64)  475.82                80
 04/02/2021   22:42:31   (   0.03,-137.48) (   0.15,-137.06)   48.76                80