Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/17/2021   10:50:59   (  -0.01,-137.20) (   0.20,-138.15)  108.15                80
 05/18/2021   10:29:22   (  -0.01,-137.20) (  -0.83,-133.57)  414.89                80
 05/19/2021   22:53:38   (   0.01,-137.20) (  -0.33,-138.78)  179.58                80
 05/20/2021   22:32:00   (   0.01,-137.20) (   0.71,-134.19)  343.22                80
 05/22/2021   10:56:08   (  -0.00,-137.20) (   0.48,-139.36)  246.73                80
 05/23/2021   10:34:30   (  -0.01,-137.19) (  -0.55,-134.77)  275.63                80
 05/24/2021   22:58:47   (   0.00,-137.17) (  -0.61,-139.99)  320.22                80
 05/25/2021   22:37:09   (   0.01,-137.16) (   0.42,-135.40)  201.61                80
 05/27/2021   11:01:16   (  -0.01,-137.15) (   0.76,-140.57)  389.97                80
 05/28/2021   10:39:39   (  -0.01,-137.13) (  -0.28,-135.98)  131.35                80
 05/29/2021   23:01:15   (   0.01,-137.10) (  -0.89,-141.19)  466.02                80