Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 25.  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)
 07/26/2023   10:22:59   (   0.01,-137.01) (  -0.36,-135.23)  203.13                80
 07/27/2023   22:44:55   (  -0.02,-137.01) (  -0.79,-140.53)  401.58                80
 07/28/2023   22:28:48   (  -0.02,-137.00) (   0.18,-135.99)  114.83                80
 07/30/2023   10:50:34   (   0.02,-137.00) (   1.00,-141.26)  485.83                80
 07/31/2023   10:29:09   (   0.03,-136.99) (  -0.03,-136.72)   29.90                80
 08/02/2023   22:32:18   (  -0.03,-136.95) (  -0.14,-137.49)   60.97                80
 08/03/2023   22:16:12   (  -0.02,-136.94) (   0.90,-132.96)  454.55                80
 08/05/2023   10:37:58   (   0.02,-136.93) (   0.33,-138.21)  146.97                80
 08/06/2023   10:16:32   (   0.02,-136.91) (  -0.71,-133.68)  368.37                80
 08/07/2023   22:38:26   (  -0.03,-136.88) (  -0.48,-138.98)  238.59                80