Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/01/2021   22:49:21   (   0.04,-137.22) (  -0.35,-138.89)  190.83                80
 03/02/2021   22:33:05   (   0.04,-137.22) (   0.72,-134.32)  332.05                80
 03/04/2021   10:54:32   (  -0.04,-137.22) (   0.47,-139.49)  258.72                80
 03/05/2021   10:32:55   (  -0.04,-137.21) (  -0.54,-134.90)  263.51                80
 03/06/2021   22:54:32   (   0.03,-137.20) (  -0.63,-140.11)  332.02                80
 03/07/2021   22:38:15   (   0.03,-137.20) (   0.38,-135.53)  189.98                80
 03/09/2021   10:59:43   (  -0.02,-137.18) (   0.76,-140.71)  401.69                80
 03/10/2021   10:38:05   (  -0.01,-137.17) (  -0.26,-136.12)  120.06                80
 03/11/2021   22:59:42   (   0.00,-137.15) (  -0.96,-141.32)  476.08                80
 03/12/2021   22:43:25   (   0.00,-137.14) (   0.11,-136.75)   45.62                80
 03/15/2021   10:45:56   (  -0.01,-137.12) (   0.02,-137.34)   25.42                80