Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 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)
 02/14/2021   22:36:29   (   0.04,-137.22) (   0.48,-135.22)  228.11                80
 02/16/2021   10:57:57   (  -0.03,-137.22) (   0.66,-140.41)  362.90                80
 02/17/2021   10:36:19   (  -0.03,-137.21) (  -0.35,-135.82)  159.36                80
 02/18/2021   22:57:57   (   0.03,-137.21) (  -0.84,-141.03)  436.02                80
 02/19/2021   22:41:39   (   0.03,-137.20) (   0.17,-136.44)   85.91                80
 02/22/2021   10:41:30   (  -0.01,-137.17) (  -0.05,-137.04)   15.10                80
 02/24/2021   22:44:10   (  -0.01,-137.13) (  -0.12,-137.66)   60.65                80
 02/25/2021   22:27:52   (  -0.01,-137.11) (   0.89,-133.07)  460.08                80
 02/27/2021   10:49:21   (   0.00,-137.08) (   0.26,-138.26)  133.82                80