Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 6.  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) (   0.15,-137.94)   83.43                80
 02/07/2021   10:25:57   (  -0.03,-137.21) (  -0.91,-133.37)  438.33                80
 02/08/2021   22:47:34   (   0.02,-137.20) (  -0.27,-138.58)  156.94                80
 02/09/2021   22:31:17   (  -0.00,-137.19) (   0.73,-133.99)  365.01                80
 02/11/2021   10:52:44   (   0.01,-137.16) (   0.47,-139.16)  228.25                80
 02/12/2021   10:31:08   (   0.00,-137.15) (  -0.60,-134.59)  292.97                80
 02/13/2021   22:52:45   (  -0.00,-137.14) (  -0.58,-139.80)  303.16                80
 02/14/2021   22:36:28   (  -0.00,-137.13) (   0.43,-135.21)  218.03                80
 02/16/2021   10:57:56   (   0.00,-137.09) (   0.71,-140.40)  375.69                80
 02/17/2021   10:36:18   (  -0.00,-137.08) (  -0.30,-135.81)  145.11                80
 02/18/2021   22:57:56   (  -0.00,-137.06) (  -0.88,-141.02)  452.01                80
 02/19/2021   22:41:38   (  -0.00,-137.03) (   0.13,-136.43)   68.46                80