Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/12/2021   22:55:28   (   0.03,-137.19) (  -0.51,-139.46)  260.26                80
 04/13/2021   22:36:31   (   0.03,-137.18) (   0.58,-134.89)  261.57                80
 04/15/2021   10:58:00   (  -0.03,-137.15) (   0.60,-140.07)  331.40                80
 04/16/2021   10:36:22   (  -0.03,-137.14) (  -0.43,-135.48)  189.84                80
 04/17/2021   22:57:57   (   0.03,-137.11) (  -0.78,-140.68)  406.48                80
 04/18/2021   22:41:40   (   0.03,-137.10) (   0.24,-136.09)  114.37                80
 04/20/2021   11:03:08   (  -0.02,-137.06) (   0.94,-141.27)  479.87                80
 04/21/2021   10:41:31   (  -0.02,-137.04) (  -0.09,-136.68)   40.53                80
 04/23/2021   22:44:10   (   0.01,-136.98) (  -0.03,-137.31)   37.04                80
 04/24/2021   22:27:52   (   0.01,-136.95) (   0.99,-132.72)  483.10                80