Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/16/2021   10:57:56   (  -0.03,-137.22) (   0.68,-140.40)  362.85                80
 02/17/2021   10:36:19   (  -0.03,-137.21) (  -0.33,-135.81)  159.32                80
 02/18/2021   22:57:56   (   0.03,-137.20) (  -0.85,-141.03)  436.50                80
 02/19/2021   22:41:40   (   0.03,-137.19) (   0.21,-136.45)   85.33                80
 02/22/2021   10:41:30   (  -0.01,-137.16) (  -0.03,-137.03)   14.69                80
 02/24/2021   22:44:10   (  -0.01,-137.12) (  -0.14,-137.66)   61.65                80
 02/25/2021   22:27:53   (  -0.01,-137.10) (   0.93,-133.08)  459.03                80
 02/27/2021   10:49:20   (   0.00,-137.07) (   0.27,-138.25)  134.69                80
 02/28/2021   10:27:43   (   0.00,-137.05) (  -0.74,-133.66)  385.58                80
 03/01/2021   22:49:20   (  -0.00,-137.01) (  -0.43,-138.88)  213.15                80