Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/25/2021   10:53:36   (   0.05,-137.21) (   0.25,-138.06)   97.79                80
 08/26/2021   10:31:59   (   0.05,-137.21) (  -0.81,-133.48)  425.59                80
 08/27/2021   22:53:34   (  -0.04,-137.20) (  -0.36,-138.68)  168.34                80
 08/28/2021   22:37:16   (  -0.04,-137.20) (   0.65,-134.09)  354.68                80
 08/30/2021   10:58:44   (   0.04,-137.20) (   0.48,-139.27)  235.68                80
 08/31/2021   10:37:05   (   0.04,-137.19) (  -0.53,-134.67)  286.74                80
 09/01/2021   22:58:41   (  -0.03,-137.17) (  -0.63,-139.88)  308.89                80
 09/02/2021   22:42:22   (  -0.02,-137.16) (   0.37,-135.29)  213.05                80
 09/04/2021   11:01:11   (   0.00,-137.15) (   0.75,-140.47)  378.88                80
 09/05/2021   10:44:53   (   0.00,-137.13) (  -0.31,-135.89)  142.74                80
 09/06/2021   23:03:47   (   0.00,-137.10) (  -0.90,-141.08)  453.97                80
 09/07/2021   22:47:30   (   0.00,-137.09) (   0.16,-136.50)   67.58                80