Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 12 18.  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)
 12/18/2023   22:45:32   (  -0.00,-136.99) (  -0.82,-140.75)  427.44                80
 12/19/2023   22:29:26   (  -0.01,-136.99) (   0.14,-136.21)   88.89                80
 12/22/2023   10:32:30   (   0.00,-136.99) (   0.00,-136.95)    4.64                80
 12/24/2023   22:33:02   (  -0.00,-136.96) (  -0.16,-137.72)   86.32                80
 12/25/2023   22:16:58   (  -0.00,-136.95) (   0.87,-133.19)  429.01                80
 12/27/2023   10:36:05   (   0.00,-136.94) (   0.34,-138.45)  172.59                80
 12/28/2023   10:20:00   (   0.00,-136.93) (  -0.69,-133.93)  342.55                80
 12/29/2023   22:39:16   (  -0.01,-136.90) (  -0.54,-139.22)  264.68                80
 12/30/2023   22:23:11   (  -0.01,-136.88) (   0.50,-134.69)  250.34                80
 01/01/2024   10:42:18   (   0.01,-136.87) (   0.70,-139.95)  351.73                80