Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 25.  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)
 06/25/2023   22:45:18   (  -0.01,-137.00) (  -0.81,-140.59)  408.71                80
 06/26/2023   22:29:13   (  -0.02,-137.00) (   0.18,-136.05)  107.53                80
 06/28/2023   10:48:20   (   0.02,-137.00) (   0.97,-141.33)  492.83                80
 06/29/2023   10:32:16   (  -0.02,-136.99) (  -0.08,-136.80)   21.94                80
 07/01/2023   22:32:46   (   0.02,-136.95) (  -0.13,-137.57)   70.50                80
 07/02/2023   22:16:40   (   0.02,-136.93) (   0.87,-133.03)  444.22                80
 07/04/2023   10:35:47   (  -0.02,-136.91) (   0.28,-138.31)  158.30                80
 07/05/2023   10:19:42   (  -0.01,-136.89) (  -0.72,-133.77)  356.15                80
 07/06/2023   22:38:57   (   0.00,-136.85) (  -0.47,-139.07)  252.49                80
 07/07/2023   22:22:52   (  -0.00,-136.83) (   0.54,-134.54)  262.01                80