Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/12/2021   22:49:55   (  -0.05,-137.19) (  -0.17,-137.67)   55.34                80
 09/13/2021   22:33:38   (  -0.04,-137.18) (   0.90,-133.09)  467.10                80
 09/15/2021   10:52:25   (   0.04,-137.17) (   0.26,-138.26)  123.85                80
 09/16/2021   10:36:06   (   0.03,-137.16) (  -0.74,-133.67)  398.16                80
 09/17/2021   22:55:02   (  -0.02,-137.14) (  -0.42,-138.88)  198.08                80
 09/18/2021   22:38:44   (  -0.02,-137.13) (   0.64,-134.29)  323.92                80
 09/20/2021   10:57:32   (   0.01,-137.12) (   0.52,-139.47)  267.25                80
 09/21/2021   10:41:13   (   0.01,-137.10) (  -0.49,-134.87)  254.76                80
 09/22/2021   23:00:08   (  -0.01,-137.08) (  -0.68,-140.08)  341.67                80
 09/23/2021   22:43:50   (  -0.02,-137.06) (   0.33,-135.48)  180.06                80