Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2019   10:41:51   (  -0.01,-137.21) (   0.09,-137.73)   58.82                80
 05/21/2019   10:20:16   (  -0.00,-137.21) (  -0.89,-133.15)  461.92                80
 05/22/2019   22:41:57   (   0.00,-137.18) (  -0.28,-138.40)  138.96                80
 05/23/2019   22:25:43   (  -0.00,-137.17) (   0.76,-133.83)  381.78                80
 05/25/2019   10:47:14   (   0.00,-137.19) (   0.43,-139.03)  209.68                80
 05/26/2019   10:25:39   (   0.01,-137.18) (  -0.61,-134.46)  310.47                80
 05/27/2019   22:47:21   (  -0.01,-137.14) (  -0.56,-139.71)  291.94                80
 05/28/2019   22:31:05   (  -0.01,-137.14) (   0.42,-135.13)  228.25                80
 05/30/2019   10:52:37   (   0.00,-137.15) (   0.71,-140.34)  363.66                80
 05/31/2019   10:31:02   (   0.01,-137.14) (  -0.28,-135.76)  155.76                80
 06/01/2019   22:52:43   (   0.00,-137.08) (  -0.89,-141.01)  448.63                80
 06/02/2019   22:36:29   (   0.00,-137.06) (   0.15,-136.45)   70.51                80