Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/13/2021   22:33:51   (   0.03,-137.20) (   0.55,-134.88)  264.34                80
 04/15/2021   10:57:59   (  -0.03,-137.20) (   0.62,-140.06)  326.18                80
 04/16/2021   10:36:22   (  -0.03,-137.20) (  -0.41,-135.47)  196.33                80
 04/17/2021   23:00:38   (   0.03,-137.19) (  -0.75,-140.69)  398.43                80
 04/18/2021   22:39:19   (   0.03,-137.18) (   0.28,-136.10)  123.70                62
 04/20/2021   11:03:09   (  -0.02,-137.17) (   0.90,-141.28)  468.15                80
 04/21/2021   10:41:31   (  -0.02,-137.16) (  -0.13,-136.69)   53.54                80
 04/23/2021   22:46:49   (   0.01,-137.12) (  -0.05,-137.30)   21.12                80
 04/26/2021   10:49:20   (  -0.01,-137.08) (   0.20,-137.89)   93.03                80