Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 11.  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,-137.01) (  -0.81,-140.57)  406.84                80
 07/12/2023   22:29:03   (   0.02,-137.01) (   0.20,-136.04)  109.97                80
 07/14/2023   10:50:51   (  -0.01,-137.01) (   0.93,-141.31)  490.39                80
 07/15/2023   10:29:25   (  -0.01,-137.00) (  -0.08,-136.78)   25.96                80
 07/17/2023   22:32:35   (   0.01,-136.99) (  -0.09,-137.55)   62.95                80
 07/18/2023   22:16:29   (   0.01,-136.99) (   0.92,-133.01)  453.16                80
 07/20/2023   10:35:36   (  -0.01,-136.98) (   0.27,-138.28)  148.09                80
 07/21/2023   10:19:30   (  -0.01,-136.97) (  -0.75,-133.74)  367.84                80
 07/22/2023   22:38:45   (   0.00,-136.95) (  -0.48,-139.04)  237.74                80
 07/23/2023   22:22:39   (   0.00,-136.94) (   0.54,-134.50)  277.97                80
 07/25/2023   10:41:45   (  -0.00,-136.93) (   0.65,-139.77)  324.18                80