Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/16/2021   10:36:22   (  -0.04,-137.20) (  -0.44,-135.48)  196.43                80
 04/17/2021   23:00:38   (   0.03,-137.19) (  -0.77,-140.68)  398.46                80
 04/18/2021   22:39:35   (   0.03,-137.18) (   0.25,-136.09)  123.67                45
 04/20/2021   11:03:08   (  -0.02,-137.17) (   0.92,-141.27)  468.11                80
 04/21/2021   10:41:31   (  -0.02,-137.16) (  -0.10,-136.68)   53.63                80
 04/23/2021   22:44:10   (   0.01,-137.12) (  -0.02,-137.31)   21.14                80
 04/26/2021   10:49:21   (  -0.01,-137.08) (   0.18,-137.90)   93.04                80
 04/27/2021   10:27:43   (  -0.02,-137.06) (  -0.85,-133.31)  427.65                80
 04/28/2021   22:49:19   (   0.01,-137.02) (  -0.30,-138.52)  170.20                80
 04/29/2021   22:33:02   (   0.02,-137.00) (   0.73,-133.93)  350.05                80