Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/16/2021   11:04:02   (   0.02,-137.20) (   0.81,-140.83)  412.64                80
 10/17/2021   10:47:43   (   0.02,-137.20) (  -0.21,-136.23)  110.63                80
 10/18/2021   23:06:38   (  -0.02,-137.19) (  -0.98,-141.44)  484.47                80
 10/19/2021   22:50:20   (  -0.02,-137.18) (   0.04,-136.84)   38.70                80
 10/22/2021   10:50:08   (   0.02,-137.18) (   0.09,-137.42)   27.60                80
 10/23/2021   10:33:49   (   0.03,-137.17) (  -0.93,-132.82)  494.93                80
 10/24/2021   22:52:46   (  -0.02,-137.14) (  -0.20,-138.04)  101.70                80
 10/25/2021   22:36:27   (  -0.02,-137.13) (   0.83,-133.45)  420.33                80
 10/27/2021   10:55:12   (   0.02,-137.11) (   0.38,-138.60)  170.48                80
 10/28/2021   10:38:55   (   0.01,-137.10) (  -0.71,-134.02)  351.09                80