Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 29.  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)
 07/01/2023   22:32:46   (   0.02,-137.00) (  -0.12,-137.57)   65.45                80
 07/02/2023   22:16:40   (   0.02,-136.99) (   0.87,-133.03)  450.04                80
 07/04/2023   10:35:48   (  -0.02,-136.97) (   0.27,-138.31)  151.50                80
 07/05/2023   10:19:42   (  -0.01,-136.96) (  -0.73,-133.77)  363.67                80
 07/06/2023   22:38:57   (   0.01,-136.93) (  -0.47,-139.07)  243.77                80
 07/07/2023   22:22:52   (   0.00,-136.92) (   0.53,-134.54)  271.43                80
 07/09/2023   10:41:58   (  -0.00,-136.90) (   0.67,-139.80)  330.44                80
 07/10/2023   10:25:53   (   0.00,-136.89) (  -0.33,-135.26)  184.48                80
 07/11/2023   22:45:08   (   0.00,-136.85) (  -0.85,-140.56)  423.87                80
 07/12/2023   22:29:03   (   0.01,-136.83) (   0.16,-136.03)   90.62                80