Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/02/2021   22:45:08   (   0.04,-137.20) (   0.05,-137.03)   18.61                80
 04/05/2021   10:47:39   (  -0.03,-137.17) (   0.10,-137.62)   52.51                80
 04/06/2021   10:26:03   (  -0.03,-137.16) (  -0.98,-133.05)  469.20                80
 04/07/2021   22:47:38   (   0.02,-137.14) (  -0.25,-138.25)  126.10                80
 04/08/2021   22:31:21   (   0.02,-137.13) (   0.77,-133.66)  395.57                80
 04/10/2021   10:52:49   (  -0.01,-137.11) (   0.40,-138.84)  197.45                80
 04/11/2021   10:31:12   (  -0.02,-137.10) (  -0.68,-134.26)  323.84                80
 04/12/2021   22:52:48   (   0.02,-137.08) (  -0.54,-139.46)  272.35                80
 04/13/2021   22:36:30   (   0.02,-137.06) (   0.49,-134.87)  248.67                80