Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/19/2021   22:50:21   (  -0.03,-137.19) (   0.07,-136.85)   39.80                80
 10/22/2021   10:50:07   (   0.03,-137.18) (   0.11,-137.41)   27.27                80
 10/23/2021   10:33:50   (   0.03,-137.17) (  -0.97,-132.83)  495.41                80
 10/24/2021   22:52:45   (  -0.02,-137.15) (  -0.22,-138.03)  100.64                80
 10/25/2021   22:36:27   (  -0.02,-137.13) (   0.81,-133.44)  421.37                80
 10/27/2021   10:55:13   (   0.02,-137.11) (   0.33,-138.61)  169.93                80
 10/28/2021   10:38:55   (   0.02,-137.10) (  -0.69,-134.02)  351.61                80
 10/29/2021   22:57:50   (  -0.01,-137.06) (  -0.49,-139.22)  245.78                80
 10/30/2021   22:41:31   (  -0.01,-137.04) (   0.53,-134.63)  275.51                80
 11/01/2021   11:00:18   (   0.01,-137.01) (   0.61,-139.80)  316.61                80