Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 7 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/21/2020   10:35:36   (   0.01,-137.20) (  -0.15,-136.53)   76.58                80
 07/23/2020   22:38:18   (  -0.01,-137.21) (  -0.01,-137.17)    4.21                80
 07/26/2020   10:43:32   (   0.01,-137.21) (   0.15,-137.78)   65.27                80
 07/27/2020   10:21:55   (   0.02,-137.21) (  -0.86,-133.20)  456.69                80
 07/28/2020   22:43:33   (  -0.02,-137.21) (  -0.30,-138.43)  139.35                80
 07/29/2020   22:27:17   (  -0.02,-137.20) (   0.71,-133.84)  382.20                80
 07/31/2020   10:46:07   (   0.03,-137.19) (   0.45,-139.04)  210.76                80
 08/01/2020   10:29:51   (   0.03,-137.18) (  -0.56,-134.46)  310.41                80
 08/02/2020   22:48:49   (  -0.04,-137.17) (  -0.59,-139.68)  286.66                80
 08/03/2020   22:32:33   (  -0.04,-137.16) (   0.43,-135.10)  234.31                80