Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 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)
 04/26/2021   10:49:20   (  -0.02,-137.20) (   0.15,-137.90)   80.21                80
 04/27/2021   10:27:43   (  -0.03,-137.19) (  -0.89,-133.31)  442.00                80
 04/28/2021   22:49:19   (   0.02,-137.18) (  -0.26,-138.52)  153.05                80
 04/29/2021   22:33:02   (   0.03,-137.17) (   0.77,-133.94)  368.77                80
 05/01/2021   10:54:29   (  -0.02,-137.15) (   0.45,-139.10)  223.64                80
 05/02/2021   10:32:52   (  -0.02,-137.13) (  -0.58,-134.52)  297.77                80
 05/03/2021   22:54:28   (   0.01,-137.11) (  -0.56,-139.73)  298.48                80
 05/04/2021   22:38:10   (   0.01,-137.10) (   0.48,-135.14)  222.95                80
 05/06/2021   10:59:38   (  -0.01,-137.07) (   0.74,-140.31)  369.73                80
 05/07/2021   10:38:00   (  -0.01,-137.06) (  -0.29,-135.72)  151.45                80
 05/08/2021   22:59:37   (   0.01,-137.03) (  -0.85,-140.94)  445.43                80
 05/09/2021   22:43:18   (   0.01,-137.01) (   0.13,-136.34)   75.60                80