Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 19.  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)
 07/20/2023   10:38:15   (   0.01,-137.00) (   0.30,-138.27)  144.44                80
 07/21/2023   10:16:50   (   0.01,-137.00) (  -0.72,-133.73)  372.42                80
 07/22/2023   22:38:45   (  -0.01,-137.00) (  -0.45,-139.04)  231.57                80
 07/23/2023   22:22:39   (  -0.01,-137.00) (   0.57,-134.51)  285.04                80
 07/25/2023   10:44:26   (   0.01,-137.00) (   0.61,-139.77)  315.64                80
 07/26/2023   10:22:59   (   0.02,-136.99) (  -0.36,-135.23)  200.47                80
 07/27/2023   22:44:54   (  -0.02,-136.98) (  -0.80,-140.53)  404.99                80
 07/28/2023   22:28:48   (  -0.02,-136.96) (   0.17,-135.99)  110.51                80
 07/30/2023   10:50:34   (   0.03,-136.94) (   1.01,-141.26)  491.97                80
 07/31/2023   10:29:09   (   0.03,-136.92) (  -0.02,-136.72)   22.92                80