Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2022 12 21.  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)
 12/21/2022   22:34:12   (   0.01,-137.34) (  -0.03,-137.53)   20.99                80
 12/22/2022   22:18:08   (   0.01,-137.34) (   0.99,-133.00)  494.82                80
 12/24/2022   10:39:55   (  -0.01,-137.33) (   0.23,-138.27)  107.19                80
 12/25/2022   10:18:31   (  -0.00,-137.33) (  -0.79,-133.74)  408.27                80
 12/26/2022   22:40:27   (  -0.00,-137.32) (  -0.41,-139.05)  197.91                80
 12/27/2022   22:24:22   (  -0.00,-137.31) (   0.61,-134.52)  317.50                80
 12/29/2022   10:43:31   (   0.01,-137.30) (   0.54,-139.80)  284.86                80
 12/30/2022   10:27:25   (   0.01,-137.29) (  -0.43,-135.27)  230.40                80
 12/31/2022   22:46:42   (  -0.00,-137.28) (  -0.76,-140.57)  376.28                80
 01/01/2023   22:30:37   (  -0.00,-137.27) (   0.27,-136.05)  138.60                80
 01/03/2023   10:49:44   (   0.00,-137.24) (   0.94,-141.32)  464.79                80
 01/04/2023   10:33:40   (   0.00,-137.23) (  -0.09,-136.79)   49.65                80