Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/09/2021   10:59:43   (  -0.04,-137.20) (   0.72,-140.71)  400.46                80
 03/10/2021   10:38:06   (  -0.04,-137.19) (  -0.29,-136.12)  121.63                80
 03/11/2021   22:59:43   (   0.03,-137.19) (  -0.87,-141.34)  472.94                80
 03/12/2021   22:43:26   (   0.03,-137.18) (   0.15,-136.75)   49.17                80
 03/15/2021   10:45:55   (  -0.03,-137.15) (   0.04,-137.33)   21.85                80
 03/16/2021   10:24:19   (  -0.03,-137.14) (  -1.04,-132.76)  499.82                80
 03/17/2021   22:45:55   (   0.03,-137.13) (  -0.17,-137.97)   95.79                80
 03/18/2021   22:29:38   (   0.03,-137.11) (   0.85,-133.38)  425.42                80
 03/20/2021   10:51:06   (  -0.02,-137.08) (   0.30,-138.56)  168.60                80
 03/21/2021   10:29:29   (  -0.02,-137.06) (  -0.72,-133.97)  352.02                80