Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/15/2021   10:58:00   (  -0.03,-137.20) (   0.59,-140.07)  326.14                80
 04/16/2021   10:36:22   (  -0.03,-137.20) (  -0.44,-135.48)  196.39                80
 04/17/2021   23:00:38   (   0.03,-137.19) (  -0.77,-140.68)  398.38                80
 04/18/2021   22:41:40   (   0.03,-137.18) (   0.25,-136.09)  123.78                80
 04/20/2021   11:03:08   (  -0.02,-137.17) (   0.92,-141.27)  468.07                80
 04/21/2021   10:41:31   (  -0.02,-137.16) (  -0.11,-136.68)   53.67                80
 04/23/2021   22:44:10   (   0.01,-137.12) (  -0.01,-137.31)   20.99                80
 04/26/2021   10:49:21   (  -0.01,-137.08) (   0.16,-137.90)   92.84                80
 04/27/2021   10:27:43   (  -0.01,-137.06) (  -0.87,-133.31)  427.89                80