Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 10.  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)
 07/11/2023   22:45:09   (   0.01,-137.00) (  -0.79,-140.57)  407.40                80
 07/12/2023   22:29:03   (   0.01,-137.00) (   0.22,-136.04)  109.08                80
 07/14/2023   10:50:50   (  -0.01,-136.99) (   0.98,-141.30)  491.66                80
 07/15/2023   10:29:24   (  -0.01,-136.99) (  -0.03,-136.77)   24.49                80
 07/17/2023   22:32:34   (   0.01,-136.97) (  -0.14,-137.54)   65.62                80
 07/18/2023   22:16:29   (   0.01,-136.96) (   0.87,-133.00)  450.14                80
 07/20/2023   10:35:36   (  -0.01,-136.94) (   0.26,-138.28)  151.57                80
 07/21/2023   10:19:31   (  -0.01,-136.93) (  -0.75,-133.75)  364.03                80
 07/22/2023   22:38:45   (   0.01,-136.91) (  -0.47,-139.04)  242.23                80
 07/23/2023   22:22:39   (   0.00,-136.90) (   0.54,-134.50)  273.13                80