Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 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)
 01/11/2021   10:40:33   (  -0.03,-137.24) (  -0.22,-136.40)   96.01                80
 01/12/2021   22:59:31   (   0.02,-137.25) (  -0.94,-141.62)  497.79                80
 01/13/2021   22:43:13   (   0.02,-137.25) (   0.06,-137.03)   24.93                80
 01/16/2021   10:45:45   (  -0.03,-137.24) (   0.06,-137.63)   44.01                80
 01/17/2021   10:24:09   (  -0.03,-137.24) (  -1.00,-133.05)  478.51                80
 01/18/2021   22:45:45   (   0.03,-137.24) (  -0.22,-138.26)  115.93                80
 01/19/2021   22:29:28   (   0.03,-137.24) (   0.84,-133.68)  406.42                80
 01/21/2021   10:50:57   (  -0.02,-137.23) (   0.34,-138.86)  185.48                80
 01/22/2021   10:29:19   (  -0.02,-137.22) (  -0.67,-134.27)  336.44                80
 01/23/2021   22:50:55   (  -0.02,-137.21) (  -0.55,-139.47)  258.38                80
 01/24/2021   22:34:39   (  -0.02,-137.20) (   0.51,-134.90)  262.98                80