Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 19.  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)
 04/20/2023   10:42:11   (   0.00,-137.01) (   0.58,-139.75)  311.26                80
 04/21/2023   10:26:04   (   0.00,-137.01) (  -0.38,-135.20)  205.97                80
 04/22/2023   22:45:17   (  -0.00,-136.99) (  -0.80,-140.49)  399.16                80
 04/23/2023   22:29:11   (  -0.00,-136.99) (   0.23,-135.96)  117.58                80
 04/25/2023   10:48:15   (  -0.00,-136.99) (   0.96,-141.21)  481.49                80
 04/26/2023   10:32:09   (  -0.00,-136.99) (  -0.07,-136.68)   34.93                80
 04/28/2023   22:35:14   (  -0.00,-136.95) (  -0.11,-137.43)   54.66                80
 04/29/2023   22:13:48   (  -0.00,-136.94) (   0.93,-132.90)  461.60                80
 05/01/2023   10:38:11   (   0.01,-136.94) (   0.31,-138.14)  138.16                80
 05/02/2023   10:16:45   (   0.00,-136.93) (  -0.74,-133.61)  377.81                80