Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/21/2019   10:20:16   (   0.00,-137.20) (  -0.91,-133.15)  461.45                80
 05/22/2019   22:41:57   (   0.00,-137.17) (  -0.26,-138.40)  140.29                80
 05/23/2019   22:25:43   (   0.01,-137.16) (   0.78,-133.83)  379.76                80
 05/25/2019   10:47:14   (  -0.01,-137.17) (   0.41,-139.03)  212.60                80
 05/26/2019   10:25:40   (  -0.01,-137.16) (  -0.62,-134.47)  306.86                80
 05/27/2019   22:47:21   (   0.01,-137.11) (  -0.55,-139.71)  296.24                80
 05/28/2019   22:31:06   (   0.01,-137.10) (   0.43,-135.13)  223.34                80
 05/30/2019   10:52:38   (  -0.01,-137.11) (   0.70,-140.35)  369.25                80
 05/31/2019   10:31:03   (  -0.02,-137.09) (  -0.34,-135.78)  149.55                80
 06/01/2019   22:52:44   (   0.02,-137.02) (  -0.89,-141.01)  455.45                80
 06/02/2019   22:36:29   (   0.02,-137.00) (   0.15,-136.45)   63.07                80