Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 30.  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   (  -0.02,-137.22) (   0.27,-138.52)  148.08                80
 01/01/2021   10:30:10   (  -0.02,-137.21) (  -0.79,-133.94)  373.75                80
 01/02/2021   22:49:06   (   0.03,-137.20) (  -0.42,-139.15)  222.75                80
 01/03/2021   22:32:50   (   0.03,-137.19) (   0.64,-134.57)  298.81                80
 01/05/2021   10:54:18   (  -0.03,-137.18) (   0.57,-139.75)  293.63                80
 01/06/2021   10:32:41   (  -0.03,-137.16) (  -0.49,-135.17)  227.61                80
 01/07/2021   22:54:18   (   0.03,-137.14) (  -0.71,-140.38)  369.84                80
 01/08/2021   22:38:01   (   0.02,-137.12) (   0.35,-135.80)  151.12                80
 01/10/2021   10:56:50   (  -0.00,-137.10) (   0.85,-140.98)  442.10                80
 01/11/2021   10:40:32   (   0.01,-137.07) (  -0.15,-136.39)   78.57                80