Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/14/2021   22:45:15   (  -0.03,-137.20) (   0.30,-135.65)  175.81                80
 10/16/2021   11:04:01   (   0.02,-137.20) (   0.86,-140.82)  412.62                80
 10/17/2021   10:47:43   (   0.02,-137.20) (  -0.22,-136.24)  110.72                80
 10/18/2021   23:06:39   (  -0.02,-137.19) (  -0.97,-141.44)  484.41                80
 10/19/2021   22:50:20   (  -0.02,-137.19) (   0.05,-136.85)   38.75                80
 10/22/2021   10:50:08   (   0.02,-137.18) (   0.08,-137.42)   27.37                80
 10/23/2021   10:33:50   (   0.02,-137.17) (  -0.94,-132.83)  495.17                80
 10/24/2021   22:52:46   (  -0.02,-137.15) (  -0.19,-138.04)  101.46                80
 10/25/2021   22:36:27   (  -0.02,-137.13) (   0.83,-133.45)  420.59                80
 10/27/2021   10:55:14   (   0.02,-137.12) (   0.32,-138.62)  170.15                80