Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2020   10:38:42   (  -0.02,-137.23) (  -0.31,-136.06)  133.95                80
 12/22/2020   22:57:39   (   0.02,-137.22) (  -0.89,-141.27)  461.94                80
 12/23/2020   22:41:22   (   0.02,-137.21) (   0.16,-136.69)   60.30                80
 12/26/2020   10:41:14   (  -0.01,-137.20) (   0.01,-137.28)    9.33                80
 12/28/2020   22:43:54   (  -0.00,-137.17) (  -0.16,-137.92)   85.09                80
 12/29/2020   22:27:36   (  -0.01,-137.15) (   0.83,-133.32)  435.95                80
 12/31/2020   10:46:26   (   0.01,-137.13) (   0.33,-138.51)  157.28                80
 01/01/2021   10:30:09   (   0.01,-137.11) (  -0.72,-133.93)  363.18                80
 01/02/2021   22:49:05   (  -0.01,-137.07) (  -0.48,-139.14)  235.73                80
 01/03/2021   22:32:49   (  -0.01,-137.05) (   0.57,-134.56)  284.43                80