Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/02/2021   22:49:06   (   0.02,-137.21) (  -0.41,-139.15)  220.76                80
 01/03/2021   22:32:50   (   0.02,-137.21) (   0.64,-134.57)  301.13                80
 01/05/2021   10:54:18   (  -0.03,-137.20) (   0.57,-139.75)  291.14                80
 01/06/2021   10:32:42   (  -0.02,-137.19) (  -0.49,-135.17)  230.49                80
 01/07/2021   22:54:18   (   0.02,-137.17) (  -0.72,-140.38)  366.00                80
 01/08/2021   22:38:01   (   0.01,-137.16) (   0.33,-135.80)  155.45                80
 01/10/2021   10:59:30   (   0.01,-137.13) (   0.87,-140.97)  437.55                80
 01/11/2021   10:37:52   (   0.01,-137.12) (  -0.13,-136.38)   83.15                80
 01/13/2021   22:43:13   (  -0.01,-137.06) (   0.03,-137.02)    6.10                80