Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2019   10:51:14   (   0.00,-137.21) (   0.66,-140.12)  332.75                80
 12/02/2019   10:29:39   (  -0.00,-137.20) (  -0.36,-135.55)  188.16                80
 12/03/2019   22:53:58   (   0.00,-137.19) (  -0.81,-140.78)  409.59                80
 12/04/2019   22:32:23   (   0.01,-137.19) (   0.22,-136.21)  111.16                80
 12/06/2019   10:56:34   (  -0.00,-137.18) (   0.98,-141.41)  482.29                80
 12/07/2019   10:35:00   (  -0.01,-137.17) (  -0.10,-136.84)   38.29                80
 12/09/2019   22:40:22   (  -0.00,-137.14) (  -0.09,-137.49)   40.26                80
 12/10/2019   22:18:47   (  -0.00,-137.13) (   0.93,-132.92)  479.57                80
 12/12/2019   10:42:58   (   0.01,-137.11) (   0.26,-138.12)  115.61                80
 12/13/2019   10:21:23   (   0.01,-137.09) (  -0.76,-133.54)  403.59                80
 12/14/2019   22:45:42   (  -0.01,-137.05) (  -0.39,-138.78)  197.01                80