Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 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)
 05/22/2021   10:56:08   (  -0.00,-137.20) (   0.47,-139.36)  246.42                80
 05/23/2021   10:34:30   (  -0.01,-137.19) (  -0.57,-134.78)  276.04                80
 05/24/2021   22:58:46   (   0.00,-137.18) (  -0.65,-139.97)  319.34                80
 05/25/2021   22:37:08   (   0.01,-137.17) (   0.39,-135.39)  202.62                80
 05/27/2021   11:01:15   (  -0.00,-137.15) (   0.79,-140.56)  388.94                80
 05/28/2021   10:39:38   (  -0.01,-137.14) (  -0.25,-135.97)  132.47                80
 05/29/2021   23:01:14   (   0.01,-137.11) (  -0.92,-141.19)  464.53                80
 05/30/2021   22:44:57   (   0.01,-137.10) (   0.13,-136.60)   56.76                80
 06/02/2021   10:47:27   (  -0.00,-137.06) (  -0.00,-137.19)   14.44                80
 06/04/2021   22:47:24   (   0.00,-137.01) (  -0.18,-137.80)   90.47                80