Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/06/2021   10:47:34   (  -0.03,-137.22) (   0.14,-137.95)   83.12                80
 02/07/2021   10:25:56   (  -0.03,-137.21) (  -0.87,-133.36)  438.62                80
 02/08/2021   22:47:34   (  -0.00,-137.20) (  -0.32,-138.57)  156.59                80
 02/09/2021   22:31:16   (  -0.01,-137.19) (   0.69,-133.98)  365.11                80
 02/11/2021   10:52:45   (   0.01,-137.17) (   0.45,-139.17)  227.94                80
 02/12/2021   10:31:07   (   0.01,-137.15) (  -0.55,-134.58)  293.28                80
 02/13/2021   22:52:44   (  -0.01,-137.14) (  -0.63,-139.79)  303.18                80
 02/14/2021   22:36:28   (  -0.00,-137.13) (   0.44,-135.22)  218.04                80
 02/16/2021   10:57:55   (   0.00,-137.10) (   0.76,-140.39)  375.28                80
 02/17/2021   10:36:19   (   0.00,-137.08) (  -0.31,-135.81)  145.55                80