Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/31/2020   10:46:26   (  -0.01,-137.22) (   0.27,-138.52)  147.26                80
 01/01/2021   10:30:09   (  -0.01,-137.22) (  -0.73,-133.93)  375.07                80
 01/02/2021   22:49:06   (   0.01,-137.21) (  -0.42,-139.15)  220.63                80
 01/03/2021   22:32:50   (   0.02,-137.21) (   0.64,-134.57)  301.34                80
 01/05/2021   10:54:18   (  -0.02,-137.20) (   0.57,-139.75)  290.66                80
 01/06/2021   10:35:21   (  -0.02,-137.19) (  -0.49,-135.17)  231.02                80
 01/07/2021   22:54:18   (   0.01,-137.17) (  -0.72,-140.38)  365.69                80
 01/08/2021   22:38:01   (   0.00,-137.16) (   0.34,-135.80)  155.75                80
 01/10/2021   10:56:50   (   0.01,-137.14) (   0.86,-140.97)  437.08                80
 01/11/2021   10:37:52   (   0.01,-137.12) (  -0.14,-136.38)   83.66                80
 01/13/2021   22:43:12   (  -0.01,-137.07) (  -0.01,-137.01)    5.93                80