Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 27.  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)
 07/27/2023   22:44:55   (   0.01,-137.01) (  -0.76,-140.54)  402.02                80
 07/28/2023   22:28:49   (   0.01,-137.00) (   0.21,-136.00)  114.36                80
 07/30/2023   10:50:35   (  -0.01,-137.00) (   0.96,-141.26)  486.30                80
 07/31/2023   10:29:09   (  -0.01,-136.99) (  -0.07,-136.73)   29.40                80
 08/02/2023   22:32:18   (   0.01,-136.95) (  -0.10,-137.50)   61.42                80
 08/03/2023   22:16:12   (   0.01,-136.94) (   0.87,-132.95)  454.20                80
 08/05/2023   10:35:18   (  -0.01,-136.93) (   0.29,-138.22)  147.19                80
 08/06/2023   10:19:13   (  -0.00,-136.92) (  -0.74,-133.69)  368.25                80
 08/07/2023   22:38:27   (   0.01,-136.89) (  -0.44,-138.99)  238.76                80
 08/08/2023   22:22:20   (   0.01,-136.87) (   0.54,-134.44)  276.31                80