Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/26/2019   22:38:34   (   0.02,-137.19) (  -0.10,-137.71)   59.49                80
 09/27/2019   22:22:19   (   0.02,-137.18) (   0.90,-133.13)  461.12                80
 09/29/2019   10:41:10   (  -0.01,-137.17) (   0.25,-138.34)  133.26                80
 09/30/2019   10:24:54   (  -0.00,-137.16) (  -0.75,-133.76)  387.13                80
 10/01/2019   22:43:55   (  -0.02,-137.15) (  -0.45,-139.00)  211.35                80
 10/02/2019   22:27:39   (  -0.02,-137.14) (   0.56,-134.42)  308.66                80
 10/04/2019   10:49:11   (   0.02,-137.11) (   0.60,-139.63)  287.02                80
 10/05/2019   10:27:36   (   0.02,-137.10) (  -0.46,-135.06)  232.37                80
 10/06/2019   22:49:16   (  -0.02,-137.07) (  -0.73,-140.30)  367.74                80
 10/07/2019   22:33:01   (  -0.02,-137.05) (   0.28,-135.72)  151.45                80
 10/09/2019   10:54:32   (   0.02,-137.02) (   0.88,-140.93)  444.80                80