Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/09/2021   22:40:40   (   0.02,-137.20) (   0.20,-136.35)   96.22                80
 05/11/2021   11:04:48   (  -0.01,-137.19) (   0.94,-141.54)  494.31                80
 05/12/2021   10:43:11   (  -0.02,-137.19) (  -0.09,-136.95)   28.21                80
 05/14/2021   22:48:28   (   0.01,-137.17) (  -0.09,-137.56)   44.77                80
 05/15/2021   22:29:31   (   0.01,-137.16) (   0.95,-132.98)  477.08                80
 05/17/2021   10:50:59   (  -0.01,-137.14) (   0.19,-138.16)  115.20                80
 05/18/2021   10:29:21   (  -0.01,-137.13) (  -0.79,-133.56)  406.26                80
 05/19/2021   22:50:57   (   0.01,-137.10) (  -0.37,-138.77)  190.21                80
 05/20/2021   22:34:40   (   0.01,-137.09) (   0.67,-134.18)  330.97                80
 05/22/2021   10:56:07   (  -0.00,-137.06) (   0.52,-139.36)  262.18                80