Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 12 10.  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)
 12/11/2023   10:36:03   (   0.01,-136.99) (   0.35,-138.45)  167.33                80
 12/12/2023   10:19:59   (   0.02,-136.99) (  -0.65,-133.92)  348.81                80
 12/13/2023   22:39:15   (  -0.02,-136.97) (  -0.55,-139.22)  257.10                80
 12/14/2023   22:23:10   (  -0.03,-136.96) (   0.45,-134.69)  258.45                80
 12/16/2023   10:42:19   (   0.03,-136.95) (   0.72,-139.96)  343.24                80
 12/17/2023   10:26:14   (   0.03,-136.94) (  -0.29,-135.43)  171.98                80
 12/18/2023   22:45:30   (  -0.03,-136.92) (  -0.91,-140.73)  434.88                80
 12/19/2023   22:29:26   (  -0.03,-136.91) (   0.10,-136.20)   80.22                80
 12/22/2023   10:29:50   (   0.04,-136.88) (   0.05,-136.94)    7.29                80