Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 8.  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)
 09/08/2023   22:38:28   (   0.01,-137.01) (  -0.42,-139.03)  229.98                80
 09/09/2023   22:22:23   (   0.01,-137.00) (   0.58,-134.50)  285.89                80
 09/11/2023   10:44:12   (  -0.01,-136.99) (   0.59,-139.77)  315.96                80
 09/12/2023   10:22:47   (  -0.00,-136.99) (  -0.42,-135.24)  199.74                80
 09/13/2023   22:44:44   (   0.00,-136.98) (  -0.80,-140.54)  405.87                80
 09/14/2023   22:28:39   (   0.00,-136.97) (   0.21,-136.01)  109.63                80
 09/16/2023   10:50:27   (   0.00,-136.96) (   0.95,-141.29)  492.74                80
 09/17/2023   10:29:03   (   0.00,-136.95) (  -0.06,-136.76)   22.44                80
 09/19/2023   22:32:15   (   0.00,-136.92) (  -0.13,-137.53)   69.93                80
 09/20/2023   22:16:10   (   0.00,-136.90) (   0.89,-133.00)  444.37                80