Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/05/2021   10:30:28   (   0.04,-137.19) (  -0.82,-133.26)  447.42                80
 08/06/2021   22:52:04   (  -0.03,-137.18) (  -0.31,-138.48)  147.13                80
 08/07/2021   22:35:46   (  -0.03,-137.17) (   0.69,-133.88)  374.86                80
 08/09/2021   10:57:13   (   0.03,-137.15) (   0.48,-139.05)  217.86                80
 08/10/2021   10:38:16   (   0.03,-137.13) (  -0.57,-134.47)  303.72                80
 08/11/2021   22:57:11   (  -0.02,-137.11) (  -0.60,-139.67)  291.85                80
 08/12/2021   22:40:53   (  -0.02,-137.10) (   0.40,-135.08)  229.61                80
 08/14/2021   10:59:41   (   0.02,-137.06) (   0.72,-140.26)  364.20                80
 08/15/2021   10:43:22   (   0.02,-137.04) (  -0.27,-135.66)  156.58                80
 08/16/2021   23:02:18   (  -0.01,-137.01) (  -0.89,-140.87)  440.76                80
 08/17/2021   22:46:00   (   0.01,-136.98) (   0.17,-136.29)   79.05                80