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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/17/2021   10:24:08   (  -0.01,-137.21) (  -0.93,-133.03)  476.24                80
 01/18/2021   22:45:45   (   0.01,-137.22) (  -0.23,-138.25)  117.89                80
 01/19/2021   22:29:28   (   0.01,-137.22) (   0.82,-133.67)  404.81                80
 01/21/2021   10:50:57   (  -0.01,-137.22) (   0.35,-138.85)  186.38                80
 01/22/2021   10:29:19   (  -0.01,-137.21) (  -0.65,-134.26)  335.80                80
 01/23/2021   22:50:56   (   0.02,-137.20) (  -0.52,-139.48)  259.89                80
 01/24/2021   22:34:40   (   0.02,-137.20) (   0.53,-134.90)  261.82                80
 01/26/2021   10:56:08   (  -0.02,-137.18) (   0.64,-140.08)  330.79                80
 01/27/2021   10:34:32   (  -0.02,-137.17) (  -0.42,-135.50)  190.36                80
 01/28/2021   22:56:09   (   0.03,-137.14) (  -0.75,-140.72)  406.91                80
 01/29/2021   22:39:52   (   0.03,-137.13) (   0.25,-136.13)  113.98                80