Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/22/2021   10:29:20   (  -0.03,-137.21) (  -0.71,-134.27)  335.71                80
 01/23/2021   22:50:57   (   0.02,-137.20) (  -0.47,-139.49)  260.48                80
 01/24/2021   22:34:39   (  -0.01,-137.19) (   0.48,-134.88)  261.75                80
 01/26/2021   10:56:07   (   0.02,-137.17) (   0.69,-140.06)  331.10                80
 01/27/2021   10:34:31   (   0.01,-137.15) (  -0.37,-135.49)  189.64                80
 01/28/2021   22:56:08   (  -0.01,-137.12) (  -0.80,-140.70)  408.48                80
 01/29/2021   22:39:50   (  -0.01,-137.10) (   0.20,-136.11)  112.02                80
 01/31/2021   11:01:19   (   0.01,-137.07) (   0.96,-141.29)  481.75                80
 02/01/2021   10:39:41   (   0.01,-137.05) (  -0.05,-136.70)   38.45                80
 02/03/2021   22:42:22   (  -0.01,-136.98) (  -0.07,-137.34)   41.07                80
 02/04/2021   22:26:05   (  -0.01,-136.95) (   0.94,-132.75)  478.61                80