Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2022 12 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 12/29/2022   10:46:10   (   0.00,-137.34) (   0.57,-139.79)  280.59                80
 12/30/2022   10:24:46   (   0.01,-137.34) (  -0.45,-135.27)  235.60                80
 12/31/2022   22:46:42   (  -0.01,-137.33) (  -0.74,-140.58)  369.83                80
 01/01/2023   22:30:37   (  -0.01,-137.33) (   0.28,-136.05)  146.05                80
 01/03/2023   10:52:25   (   0.01,-137.33) (   0.92,-141.32)  455.51                80
 01/04/2023   10:31:00   (   0.01,-137.32) (  -0.11,-136.79)   59.90                80
 01/06/2023   22:34:11   (  -0.02,-137.29) (  -0.10,-137.56)   31.81                80
 01/07/2023   22:18:07   (  -0.02,-137.28) (   0.93,-133.04)  483.18                80
 01/09/2023   10:39:54   (   0.02,-137.26) (   0.27,-138.31)  119.60                80
 01/10/2023   10:18:29   (   0.02,-137.25) (  -0.76,-133.78)  395.02                80