Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/26/2021   10:56:09   (  -0.03,-137.24) (   0.58,-140.09)  324.09                80
 01/27/2021   10:34:31   (  -0.03,-137.24) (  -0.42,-135.50)  198.86                80
 01/28/2021   22:56:09   (   0.02,-137.24) (  -0.75,-140.71)  396.03                80
 01/29/2021   22:39:51   (   0.01,-137.24) (   0.25,-136.12)  126.62                80
 01/31/2021   11:01:19   (  -0.01,-137.24) (   0.90,-141.31)  463.59                80
 02/01/2021   10:39:42   (  -0.02,-137.24) (  -0.10,-136.72)   58.59                80
 02/03/2021   22:42:23   (   0.02,-137.21) (  -0.01,-137.36)   16.06                80
 02/06/2021   10:47:34   (  -0.01,-137.19) (   0.15,-137.95)   85.78                80
 02/07/2021   10:25:56   (   0.00,-137.18) (  -0.86,-133.36)  435.55                80
 02/08/2021   22:47:33   (  -0.01,-137.15) (  -0.31,-138.58)  162.52                80