Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2021   22:32:00   (   0.01,-137.20) (   0.68,-134.18)  343.39                80
 05/22/2021   10:56:07   (  -0.00,-137.20) (   0.51,-139.35)  246.55                80
 05/23/2021   10:34:30   (  -0.01,-137.19) (  -0.53,-134.77)  275.84                80
 05/24/2021   22:58:46   (   0.00,-137.17) (  -0.63,-139.98)  319.87                80
 05/25/2021   22:37:09   (   0.01,-137.16) (   0.41,-135.39)  201.97                80
 05/27/2021   11:01:16   (  -0.01,-137.15) (   0.77,-140.56)  389.55                80
 05/28/2021   10:39:38   (  -0.01,-137.13) (  -0.27,-135.98)  131.76                80
 05/29/2021   23:01:15   (   0.01,-137.10) (  -0.90,-141.19)  465.52                80
 05/30/2021   22:44:57   (   0.01,-137.09) (   0.14,-136.60)   55.75                80
 06/02/2021   10:47:26   (  -0.00,-137.05) (   0.04,-137.18)   15.46                80