Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2022 12 23.  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)
 12/24/2022   10:39:55   (   0.01,-137.34) (   0.22,-138.27)  106.54                80
 12/25/2022   10:18:31   (   0.01,-137.33) (  -0.79,-133.74)  409.06                80
 12/26/2022   22:40:27   (  -0.02,-137.32) (  -0.40,-139.05)  196.94                80
 12/27/2022   22:21:43   (  -0.02,-137.32) (   0.61,-134.52)  318.52                80
 12/29/2022   10:46:10   (   0.02,-137.31) (   0.59,-139.79)  283.65                80
 12/30/2022   10:24:45   (   0.02,-137.30) (  -0.43,-135.27)  231.68                80
 12/31/2022   22:49:22   (  -0.02,-137.29) (  -0.76,-140.57)  374.73                80
 01/01/2023   22:27:57   (  -0.03,-137.28) (   0.27,-136.05)  140.31                80
 01/03/2023   10:52:24   (   0.03,-137.26) (   0.94,-141.32)  462.74                80
 01/04/2023   10:31:00   (   0.03,-137.24) (  -0.09,-136.79)   51.86                80