Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 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)
 10/11/2021   10:58:55   (   0.03,-137.19) (   0.61,-139.62)  277.68                80
 10/12/2021   10:42:38   (   0.03,-137.18) (  -0.47,-135.04)  244.56                80
 10/13/2021   23:01:33   (  -0.03,-137.16) (  -0.72,-140.24)  351.89                80
 10/14/2021   22:45:15   (  -0.02,-137.15) (   0.29,-135.65)  170.12                80
 10/16/2021   11:04:01   (   0.02,-137.13) (   0.86,-140.82)  420.74                80
 10/17/2021   10:47:42   (   0.02,-137.12) (  -0.16,-136.23)  101.31                80
 10/18/2021   23:06:39   (  -0.01,-137.09) (  -0.97,-141.44)  495.31                80
 10/19/2021   22:50:20   (  -0.02,-137.08) (   0.04,-136.85)   26.58                80
 10/22/2021   10:50:08   (   0.02,-137.04) (   0.09,-137.42)   43.27                80
 10/23/2021   10:33:50   (   0.02,-137.02) (  -0.93,-132.83)  478.00                80
 10/24/2021   22:52:45   (  -0.01,-136.98) (  -0.25,-138.03)  120.06                80