Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/20/2021   10:51:06   (  -0.04,-137.20) (   0.29,-138.56)  155.49                80
 03/21/2021   10:29:30   (  -0.04,-137.19) (  -0.79,-133.98)  366.53                80
 03/22/2021   22:51:06   (   0.04,-137.17) (  -0.41,-139.19)  229.52                80
 03/23/2021   22:34:49   (   0.03,-137.16) (   0.61,-134.60)  292.16                80
 03/25/2021   10:56:17   (  -0.02,-137.15) (   0.55,-139.78)  299.96                80
 03/26/2021   10:34:39   (  -0.02,-137.13) (  -0.47,-135.19)  221.29                80
 03/27/2021   22:56:16   (   0.02,-137.10) (  -0.71,-140.40)  375.87                80
 03/28/2021   22:39:58   (   0.02,-137.09) (   0.31,-135.81)  145.05                80
 03/30/2021   11:01:27   (  -0.02,-137.06) (   0.86,-140.99)  448.28                80
 03/31/2021   10:39:49   (  -0.02,-137.04) (  -0.16,-136.40)   72.04                80
 04/02/2021   22:42:28   (   0.02,-136.97) (   0.02,-137.03)    6.79                80