Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 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)
 01/16/2021   10:45:45   (  -0.01,-137.23) (   0.07,-137.62)   44.28                80
 01/17/2021   10:24:08   (  -0.01,-137.23) (  -0.94,-133.03)  478.01                80
 01/18/2021   22:45:45   (   0.02,-137.23) (  -0.23,-138.25)  116.78                80
 01/19/2021   22:29:28   (   0.02,-137.23) (   0.83,-133.68)  405.31                80
 01/21/2021   10:50:57   (  -0.02,-137.21) (   0.34,-138.85)  187.13                80
 01/22/2021   10:29:19   (  -0.02,-137.20) (  -0.66,-134.26)  334.47                80
 01/23/2021   22:50:56   (   0.03,-137.19) (  -0.50,-139.48)  261.79                80
 01/24/2021   22:34:40   (   0.03,-137.18) (   0.56,-134.91)  259.32                80
 01/26/2021   10:56:08   (  -0.04,-137.15) (   0.61,-140.09)  334.61                80
 01/27/2021   10:37:11   (  -0.04,-137.13) (  -0.39,-135.50)  185.96                80