Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-18)   GOES-18 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2023   22:41:55   (  -0.02,-137.00) (  -0.52,-139.23)  254.39                80
 12/14/2023   22:20:31   (  -0.01,-137.00) (   0.48,-134.70)  261.56                80
 12/16/2023   10:44:59   (   0.00,-137.00) (   0.69,-139.97)  339.07                80
 12/17/2023   10:23:36   (  -0.01,-136.99) (  -0.38,-135.45)  176.65                80
 12/18/2023   22:48:12   (   0.01,-136.98) (  -0.82,-140.75)  429.48                80
 12/19/2023   22:26:47   (   0.02,-136.97) (   0.20,-136.22)   86.18                80
 12/22/2023   10:32:30   (  -0.01,-136.96) (   0.01,-136.95)    3.23                80
 12/24/2023   22:35:42   (   0.00,-136.92) (  -0.18,-137.72)   90.85                80
 12/25/2023   22:14:18   (   0.00,-136.91) (   0.84,-133.19)  423.95                80
 12/27/2023   10:38:45   (   0.00,-136.89) (   0.38,-138.45)  178.41                80