Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 17.  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)
 07/18/2023   22:16:29   (   0.01,-137.00) (   0.88,-133.00)  455.04                80
 07/20/2023   10:35:36   (  -0.01,-137.00) (   0.24,-138.28)  144.96                80
 07/21/2023   10:19:29   (  -0.01,-137.00) (  -0.71,-133.73)  371.88                80
 07/22/2023   22:38:45   (   0.01,-137.00) (  -0.45,-139.04)  232.25                80
 07/23/2023   22:22:39   (   0.01,-137.00) (   0.57,-134.51)  284.34                80
 07/25/2023   10:41:46   (  -0.02,-137.00) (   0.61,-139.77)  316.44                80
 07/26/2023   10:25:40   (  -0.01,-136.99) (  -0.41,-135.24)  199.62                80
 07/27/2023   22:44:54   (   0.02,-136.98) (  -0.79,-140.53)  406.02                80
 07/28/2023   22:28:49   (   0.02,-136.96) (   0.23,-136.00)  109.37                80
 07/30/2023   10:47:55   (  -0.02,-136.94) (   0.94,-141.27)  493.39                80
 07/31/2023   10:31:50   (  -0.02,-136.92) (  -0.08,-136.74)   21.53                80