Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 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)
 10/16/2021   11:04:01   (   0.03,-137.21) (   0.84,-140.82)  412.22                80
 10/17/2021   10:47:43   (   0.03,-137.21) (  -0.18,-136.23)  111.26                80
 10/18/2021   23:06:38   (  -0.02,-137.20) (  -1.01,-141.43)  483.30                80
 10/19/2021   22:50:20   (  -0.03,-137.20) (   0.07,-136.85)   40.13                80
 10/22/2021   10:50:08   (   0.03,-137.19) (   0.05,-137.42)   25.98                80
 10/23/2021   10:33:50   (   0.03,-137.19) (  -0.97,-132.83)  496.90                80
 10/24/2021   22:52:45   (  -0.02,-137.16) (  -0.21,-138.03)   99.16                80
 10/25/2021   22:36:27   (  -0.02,-137.15) (   0.81,-133.44)  423.05                80
 10/27/2021   10:55:13   (   0.02,-137.14) (   0.33,-138.61)  167.59                80
 10/28/2021   10:38:54   (   0.02,-137.12) (  -0.69,-134.02)  354.18                80
 10/29/2021   22:57:50   (  -0.01,-137.09) (  -0.49,-139.22)  243.18                80