Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/22/2019   22:41:57   (   0.00,-137.18) (  -0.29,-138.39)  138.93                80
 05/23/2019   22:25:42   (   0.01,-137.17) (   0.74,-133.82)  381.51                80
 05/25/2019   10:47:15   (  -0.01,-137.19) (   0.39,-139.04)  210.56                80
 05/26/2019   10:25:40   (  -0.01,-137.18) (  -0.65,-134.47)  309.30                80
 05/27/2019   22:47:20   (   0.01,-137.14) (  -0.59,-139.70)  292.92                80
 05/28/2019   22:31:06   (   0.01,-137.13) (   0.45,-135.14)  227.05                80
 05/30/2019   10:52:38   (  -0.02,-137.14) (   0.68,-140.35)  365.24                80
 05/31/2019   10:31:03   (  -0.02,-137.13) (  -0.30,-135.77)  153.95                80
 06/01/2019   22:52:44   (   0.02,-137.07) (  -0.87,-141.02)  450.15                80
 06/02/2019   22:36:30   (   0.03,-137.05) (   0.16,-136.45)   68.78                80