Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/24/2021   22:58:46   (   0.00,-137.20) (  -0.64,-139.98)  317.23                80
 05/25/2021   22:37:08   (   0.01,-137.20) (   0.40,-135.39)  205.65                80
 05/27/2021   11:01:16   (  -0.00,-137.20) (   0.78,-140.56)  384.46                80
 05/28/2021   10:39:38   (  -0.01,-137.19) (  -0.26,-135.98)  137.84                80
 05/29/2021   23:01:15   (   0.01,-137.17) (  -0.91,-141.19)  457.79                80
 05/30/2021   22:44:57   (   0.01,-137.17) (   0.12,-136.60)   64.44                80
 06/02/2021   10:47:27   (  -0.00,-137.15) (   0.00,-137.19)    4.08                80
 06/04/2021   22:47:26   (   0.00,-137.12) (  -0.14,-137.81)   78.18                80
 06/05/2021   22:31:08   (   0.00,-137.11) (   0.90,-133.23)  443.71                80
 06/07/2021   10:52:36   (  -0.00,-137.10) (   0.26,-138.40)  147.70                80