Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/04/2021   22:35:31   (   0.02,-137.20) (   0.49,-135.15)  234.13                80
 05/06/2021   10:59:38   (  -0.01,-137.19) (   0.72,-140.31)  356.55                80
 05/07/2021   10:38:01   (  -0.01,-137.19) (  -0.31,-135.73)  166.23                80
 05/08/2021   22:59:37   (   0.01,-137.19) (  -0.84,-140.94)  427.64                80
 05/09/2021   22:43:20   (   0.01,-137.19) (   0.20,-136.35)   94.92                80
 05/11/2021   11:04:48   (  -0.01,-137.18) (   0.95,-141.53)  496.49                80
 05/12/2021   10:43:11   (  -0.01,-137.17) (  -0.08,-136.95)   25.58                80
 05/14/2021   22:45:48   (   0.01,-137.14) (  -0.09,-137.56)   48.34                80
 05/15/2021   22:29:31   (   0.01,-137.13) (   0.94,-132.98)  473.11                80
 05/17/2021   10:50:58   (  -0.01,-137.10) (   0.26,-138.14)  120.02                80