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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/17/2021   23:00:38   (   0.03,-137.19) (  -0.74,-140.69)  398.40                80
 04/18/2021   22:39:01   (   0.03,-137.18) (   0.28,-136.10)  123.72                80
 04/20/2021   11:03:09   (  -0.02,-137.17) (   0.89,-141.27)  468.03                80
 04/21/2021   10:41:31   (  -0.02,-137.16) (  -0.13,-136.69)   53.65                80
 04/23/2021   22:46:49   (   0.01,-137.12) (  -0.05,-137.30)   21.21                80
 04/26/2021   10:49:21   (  -0.01,-137.08) (   0.15,-137.90)   92.95                80
 04/27/2021   10:27:44   (  -0.02,-137.06) (  -0.88,-133.31)  427.78                80
 04/28/2021   22:49:19   (   0.01,-137.02) (  -0.33,-138.52)  170.03                80
 04/29/2021   22:33:02   (   0.02,-137.00) (   0.70,-133.93)  350.19                80