Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 5 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/15/2020   22:45:31   (   0.01,-137.19) (  -0.42,-139.12)  219.63                80
 05/16/2020   22:29:15   (   0.01,-137.18) (   0.58,-134.53)  301.78                80
 05/18/2020   10:50:45   (  -0.00,-137.17) (   0.57,-139.73)  291.51                80
 05/19/2020   10:29:09   (  -0.01,-137.16) (  -0.48,-135.16)  229.48                80
 05/20/2020   22:50:48   (   0.00,-137.15) (  -0.72,-140.38)  367.77                80
 05/21/2020   22:34:32   (   0.01,-137.14) (   0.33,-135.80)  152.88                80
 05/23/2020   10:56:01   (  -0.00,-137.12) (   0.87,-140.99)  441.63                80
 05/24/2020   10:34:26   (  -0.00,-137.10) (  -0.18,-136.42)   78.40                80
 05/26/2020   22:37:08   (  -0.00,-137.05) (  -0.03,-137.05)    2.94                80