Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/22/2021   10:50:08   (   0.03,-137.21) (   0.06,-137.42)   23.34                80
 10/24/2021   22:52:45   (  -0.03,-137.22) (  -0.23,-138.03)   92.43                80
 10/25/2021   22:36:28   (  -0.03,-137.22) (   0.85,-133.45)  431.42                80
 10/27/2021   10:55:13   (   0.02,-137.23) (   0.35,-138.60)  157.04                80
 10/28/2021   10:38:55   (   0.02,-137.23) (  -0.73,-134.02)  366.31                80
 10/29/2021   22:57:51   (  -0.01,-137.22) (  -0.46,-139.22)  228.45                80
 10/30/2021   22:41:32   (  -0.01,-137.22) (   0.57,-134.63)  294.64                80
 11/01/2021   11:00:18   (   0.01,-137.22) (   0.58,-139.80)  294.63                80
 11/02/2021   10:44:00   (   0.01,-137.21) (  -0.45,-135.21)  228.14                80
 11/03/2021   23:02:55   (  -0.01,-137.19) (  -0.73,-140.41)  367.58                80
 11/04/2021   22:46:37   (  -0.01,-137.18) (   0.30,-135.82)  154.74                80