Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/28/2021   22:56:09   (   0.04,-137.24) (  -0.76,-140.71)  396.67                80
 01/29/2021   22:39:52   (   0.03,-137.24) (   0.31,-136.14)  126.04                80
 01/31/2021   11:01:19   (  -0.03,-137.24) (   0.91,-141.30)  464.00                80
 02/01/2021   10:39:43   (  -0.03,-137.24) (  -0.15,-136.73)   58.18                80
 02/03/2021   22:42:23   (   0.03,-137.21) (  -0.02,-137.35)   16.59                80
 02/06/2021   10:47:34   (  -0.02,-137.20) (   0.17,-137.94)   86.09                80
 02/07/2021   10:25:57   (  -0.02,-137.18) (  -0.89,-133.37)  435.20                80
 02/08/2021   22:47:33   (  -0.00,-137.15) (  -0.35,-138.57)  162.65                80
 02/09/2021   22:31:17   (  -0.01,-137.13) (   0.71,-133.99)  358.38                80