Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/12/2021   22:49:55   (  -0.05,-137.19) (  -0.18,-137.67)   55.41                80
 09/13/2021   22:33:37   (  -0.04,-137.18) (   0.88,-133.09)  467.12                80
 09/15/2021   10:52:25   (   0.04,-137.18) (   0.28,-138.26)  123.71                80
 09/16/2021   10:36:06   (   0.03,-137.16) (  -0.73,-133.66)  398.30                80
 09/17/2021   22:55:01   (  -0.02,-137.14) (  -0.44,-138.87)  198.04                80
 09/18/2021   22:38:44   (  -0.02,-137.13) (   0.63,-134.29)  323.98                80
 09/20/2021   10:57:31   (   0.01,-137.12) (   0.53,-139.46)  267.07                80
 09/21/2021   10:41:13   (   0.01,-137.11) (  -0.48,-134.87)  254.94                80
 09/22/2021   23:00:08   (  -0.01,-137.08) (  -0.69,-140.07)  341.56                80
 09/23/2021   22:43:50   (  -0.02,-137.06) (   0.32,-135.48)  180.19                80
 09/25/2021   11:02:37   (   0.01,-137.04) (   0.84,-140.65)  411.63                80