Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/10/2021   10:35:36   (   0.04,-137.20) (  -0.58,-134.47)  311.67                80
 08/11/2021   22:57:11   (  -0.04,-137.20) (  -0.60,-139.67)  282.02                80
 08/12/2021   22:40:54   (  -0.04,-137.19) (   0.46,-135.09)  240.85                80
 08/14/2021   11:02:21   (   0.04,-137.18) (   0.72,-140.26)  350.23                80
 08/15/2021   10:40:42   (   0.04,-137.18) (  -0.28,-135.66)  172.02                80
 08/16/2021   23:02:18   (  -0.03,-137.16) (  -0.89,-140.87)  423.41                80
 08/17/2021   22:46:00   (  -0.03,-137.15) (   0.17,-136.28)   98.23                80
 08/19/2021   11:04:48   (   0.01,-137.12) (   0.96,-141.47)  494.83                80
 08/20/2021   10:48:30   (  -0.01,-137.10) (  -0.04,-136.87)   26.20                80
 08/22/2021   22:48:28   (   0.01,-137.06) (  -0.06,-137.49)   48.86                80
 08/23/2021   22:32:09   (   0.00,-137.04) (   0.94,-132.90)  472.65                80