Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/07/2021   10:52:35   (   0.01,-137.17) (   0.28,-138.39)  138.77                80
 06/08/2021   10:30:57   (   0.00,-137.16) (  -0.77,-133.80)  383.11                80
 06/09/2021   22:55:14   (  -0.00,-137.14) (  -0.42,-139.01)  212.79                80
 06/10/2021   22:33:36   (   0.00,-137.13) (   0.63,-134.43)  308.67                80
 06/12/2021   10:57:43   (  -0.00,-137.10) (   0.58,-139.59)  283.91                80
 06/13/2021   10:36:05   (  -0.01,-137.09) (  -0.47,-135.00)  237.08                80
 06/14/2021   22:57:41   (   0.01,-137.06) (  -0.71,-140.21)  360.24                80
 06/15/2021   22:41:24   (   0.01,-137.03) (   0.34,-135.63)  160.55                80
 06/17/2021   11:02:50   (  -0.00,-137.00) (   0.87,-140.79)  432.88                80
 06/18/2021   10:41:13   (  -0.00,-136.97) (  -0.18,-136.21)   87.56                80