Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 24.  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)
 07/25/2023   10:44:26   (   0.01,-137.01) (   0.60,-139.77)  314.31                80
 07/26/2023   10:23:00   (   0.01,-137.01) (  -0.42,-135.24)  202.37                80
 07/27/2023   22:44:54   (  -0.01,-137.00) (  -0.79,-140.53)  402.87                80
 07/28/2023   22:28:49   (  -0.02,-136.99) (   0.23,-136.00)  113.23                80
 07/30/2023   10:50:34   (   0.02,-136.98) (   1.00,-141.26)  487.81                80
 07/31/2023   10:29:09   (   0.02,-136.97) (  -0.03,-136.72)   27.63                80
 08/02/2023   22:32:18   (  -0.02,-136.92) (  -0.14,-137.49)   64.04                80
 08/03/2023   22:16:11   (  -0.02,-136.91) (   0.84,-132.95)  451.19                80
 08/05/2023   10:37:57   (   0.02,-136.89) (   0.33,-138.21)  150.72                80
 08/06/2023   10:16:32   (   0.02,-136.88) (  -0.71,-133.68)  364.32                80