Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/12/2021   22:59:30   (   0.03,-137.25) (  -0.97,-141.61)  497.87                80
 01/13/2021   22:43:14   (   0.03,-137.25) (   0.09,-137.03)   24.84                80
 01/16/2021   10:45:46   (  -0.03,-137.24) (   0.04,-137.63)   44.24                80
 01/17/2021   10:24:08   (  -0.03,-137.24) (  -0.97,-133.04)  478.30                80
 01/18/2021   22:45:45   (   0.03,-137.24) (  -0.20,-138.26)  116.04                80
 01/19/2021   22:29:28   (   0.03,-137.24) (   0.81,-133.67)  406.28                80
 01/21/2021   10:50:57   (  -0.03,-137.23) (   0.32,-138.86)  185.80                80
 01/22/2021   10:29:20   (  -0.03,-137.22) (  -0.69,-134.27)  336.10                80
 01/23/2021   22:50:57   (   0.02,-137.21) (  -0.48,-139.49)  259.49                80
 01/24/2021   22:34:40   (  -0.02,-137.20) (   0.53,-134.90)  262.83                80