Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/14/2019   22:39:03   (   0.02,-137.18) (  -0.13,-137.76)   66.13                80
 07/15/2019   22:22:49   (   0.02,-137.18) (   0.92,-133.19)  454.64                80
 07/17/2019   10:44:21   (  -0.02,-137.19) (   0.24,-138.40)  137.63                80
 07/18/2019   10:22:46   (  -0.02,-137.19) (  -0.80,-133.84)  382.76                80
 07/19/2019   22:44:26   (   0.03,-137.16) (  -0.42,-139.06)  218.08                80
 07/20/2019   22:28:11   (   0.02,-137.15) (   0.63,-134.50)  302.27                80
 07/22/2019   10:47:04   (  -0.03,-137.16) (   0.54,-139.71)  290.57                80
 07/23/2019   10:30:48   (  -0.02,-137.15) (  -0.44,-135.13)  229.36                80
 07/24/2019   22:49:48   (   0.03,-137.10) (  -0.71,-140.37)  372.63                80
 07/25/2019   22:33:34   (   0.03,-137.09) (   0.34,-135.81)  146.96                80