Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 13.  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)
 07/14/2023   10:50:50   (   0.00,-137.00) (   0.94,-141.31)  490.40                80
 07/15/2023   10:29:25   (   0.00,-137.00) (  -0.07,-136.78)   25.81                80
 07/17/2023   22:32:35   (   0.01,-136.98) (  -0.09,-137.55)   63.56                80
 07/18/2023   22:16:29   (   0.01,-136.98) (   0.92,-133.01)  452.28                80
 07/20/2023   10:35:36   (  -0.01,-136.96) (   0.27,-138.28)  149.67                80
 07/21/2023   10:19:30   (  -0.01,-136.95) (  -0.75,-133.74)  366.01                80
 07/22/2023   22:38:44   (   0.01,-136.94) (  -0.47,-139.04)  239.60                80
 07/23/2023   22:22:39   (   0.01,-136.93) (   0.55,-134.50)  275.89                80
 07/25/2023   10:41:45   (  -0.02,-136.90) (   0.64,-139.77)  326.86                80
 07/26/2023   10:25:40   (  -0.01,-136.89) (  -0.38,-135.24)  188.06                80