Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/28/2021   10:54:10   (   0.02,-137.19) (   0.34,-138.62)  162.54                80
 06/29/2021   10:32:32   (   0.02,-137.19) (  -0.70,-134.03)  360.02                80
 06/30/2021   22:56:48   (  -0.03,-137.17) (  -0.46,-139.24)  235.19                80
 07/01/2021   22:35:10   (  -0.02,-137.17) (   0.53,-134.64)  287.37                80
 07/03/2021   10:59:17   (   0.02,-137.16) (   0.62,-139.82)  302.87                80
 07/04/2021   10:37:40   (   0.02,-137.16) (  -0.43,-135.24)  219.12                80
 07/05/2021   22:59:15   (  -0.01,-137.13) (  -0.79,-140.44)  377.41                80
 07/06/2021   22:42:58   (  -0.01,-137.12) (   0.27,-135.85)  144.18                80
 07/08/2021   11:04:25   (  -0.00,-137.10) (   0.89,-141.03)  447.60                80
 07/09/2021   10:42:47   (  -0.01,-137.08) (  -0.16,-136.44)   73.40                80