Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 9.  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)
 09/09/2023   22:22:23   (  -0.01,-137.00) (   0.53,-134.48)  286.39                80
 09/11/2023   10:44:11   (   0.01,-136.99) (   0.64,-139.76)  315.57                80
 09/12/2023   10:22:46   (   0.01,-136.99) (  -0.37,-135.23)  200.01                80
 09/13/2023   22:44:44   (  -0.01,-136.98) (  -0.79,-140.54)  405.58                80
 09/14/2023   22:28:39   (  -0.01,-136.97) (   0.23,-136.01)  109.89                80
 09/16/2023   10:50:27   (   0.02,-136.96) (   0.99,-141.28)  492.59                80
 09/17/2023   10:29:02   (   0.01,-136.95) (  -0.02,-136.75)   22.41                80
 09/19/2023   22:32:14   (  -0.01,-136.91) (  -0.16,-137.52)   69.88                80
 09/20/2023   22:16:09   (  -0.01,-136.89) (   0.86,-132.99)  444.39                80
 09/22/2023   10:37:57   (   0.02,-136.86) (   0.35,-138.26)  160.08                80