Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 20.  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)
 07/21/2023   10:16:50   (   0.01,-137.00) (  -0.75,-133.74)  372.50                80
 07/22/2023   22:38:44   (  -0.01,-137.00) (  -0.47,-139.03)  231.56                80
 07/23/2023   22:22:39   (  -0.01,-137.00) (   0.55,-134.50)  285.02                80
 07/25/2023   10:44:25   (   0.02,-137.00) (   0.63,-139.77)  315.61                80
 07/26/2023   10:23:00   (   0.02,-136.99) (  -0.39,-135.23)  200.45                80
 07/27/2023   22:44:54   (  -0.02,-136.98) (  -0.82,-140.53)  405.08                80
 07/28/2023   22:28:49   (  -0.02,-136.96) (   0.20,-136.00)  110.38                80
 07/30/2023   10:50:35   (   0.03,-136.94) (   0.97,-141.26)  492.06                80
 07/31/2023   10:29:08   (   0.03,-136.92) (   0.00,-136.72)   22.87                80
 08/02/2023   22:34:57   (  -0.04,-136.87) (  -0.17,-137.48)   69.61                80