Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 12 14.  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)
 12/14/2023   22:20:31   (  -0.01,-137.00) (   0.48,-134.69)  261.59                80
 12/16/2023   10:45:00   (   0.00,-137.00) (   0.64,-139.98)  339.05                80
 12/17/2023   10:23:35   (  -0.01,-136.99) (  -0.37,-135.45)  176.65                80
 12/18/2023   22:48:12   (   0.01,-136.98) (  -0.82,-140.75)  429.45                80
 12/19/2023   22:26:47   (   0.02,-136.97) (   0.19,-136.22)   86.19                80
 12/22/2023   10:29:51   (  -0.01,-136.96) (  -0.04,-136.96)    2.78                80
 12/24/2023   22:35:42   (   0.00,-136.92) (  -0.19,-137.72)   90.81                80
 12/25/2023   22:14:18   (   0.00,-136.91) (   0.83,-133.19)  423.99                80
 12/27/2023   10:38:46   (   0.00,-136.89) (   0.33,-138.46)  178.35                80
 12/28/2023   10:17:20   (  -0.00,-136.87) (  -0.64,-133.92)  336.15                80