Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/23/2021   22:32:09   (  -0.05,-137.20) (   0.95,-132.89)  491.24                80
 08/25/2021   10:53:37   (   0.05,-137.21) (   0.23,-138.07)   97.68                80
 08/26/2021   10:31:58   (   0.05,-137.21) (  -0.77,-133.47)  425.74                80
 08/27/2021   22:53:33   (  -0.04,-137.20) (  -0.39,-138.68)  168.29                80
 08/28/2021   22:37:16   (  -0.04,-137.20) (   0.67,-134.09)  354.78                80
 08/30/2021   10:58:43   (   0.04,-137.20) (   0.51,-139.26)  235.32                80
 08/31/2021   10:37:06   (   0.04,-137.19) (  -0.56,-134.68)  287.15                80
 09/01/2021   22:58:40   (  -0.03,-137.17) (  -0.66,-139.88)  308.60                80
 09/02/2021   22:42:23   (  -0.02,-137.16) (   0.40,-135.29)  213.38                80
 09/04/2021   11:01:10   (   0.00,-137.15) (   0.78,-140.47)  378.28                80
 09/05/2021   10:44:52   (   0.00,-137.14) (  -0.29,-135.88)  143.37                80