Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2019   22:41:24   (   0.02,-137.19) (  -0.25,-138.38)  136.69                80
 09/11/2019   22:25:09   (   0.02,-137.18) (   0.81,-133.82)  383.80                80
 09/13/2019   10:46:41   (  -0.02,-137.18) (   0.38,-139.02)  209.72                80
 09/14/2019   10:25:05   (  -0.02,-137.17) (  -0.62,-134.44)  310.52                80
 09/15/2019   22:46:45   (   0.02,-137.15) (  -0.56,-139.68)  289.42                80
 09/16/2019   22:30:31   (   0.02,-137.14) (   0.50,-135.12)  230.51                80
 09/18/2019   10:52:02   (  -0.02,-137.12) (   0.68,-140.32)  364.05                80
 09/19/2019   10:30:27   (  -0.02,-137.11) (  -0.32,-135.74)  155.29                80
 09/20/2019   22:52:07   (   0.02,-137.07) (  -0.86,-140.98)  446.27                80
 09/21/2019   22:35:52   (   0.03,-137.05) (   0.14,-136.41)   72.55                80
 09/24/2019   10:35:49   (  -0.03,-137.00) (  -0.03,-137.05)    5.68                80