Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 14.  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)
 04/15/2023   10:38:46   (   0.01,-137.00) (   0.27,-138.26)  143.55                80
 04/16/2023   10:17:19   (   0.00,-137.00) (  -0.74,-133.72)  373.12                80
 04/17/2023   22:39:13   (  -0.00,-136.99) (  -0.46,-139.02)  231.57                80
 04/18/2023   22:23:06   (   0.00,-136.98) (   0.56,-134.48)  285.04                80
 04/20/2023   10:44:51   (  -0.01,-136.98) (   0.60,-139.75)  314.95                80
 04/21/2023   10:23:25   (  -0.02,-136.97) (  -0.42,-135.21)  201.09                80
 04/22/2023   22:45:18   (   0.02,-136.95) (  -0.76,-140.50)  404.87                80
 04/23/2023   22:29:12   (   0.02,-136.94) (   0.26,-135.97)  111.05                80
 04/25/2023   10:48:16   (  -0.02,-136.92) (   0.94,-141.22)  489.99                80
 04/26/2023   10:32:10   (  -0.02,-136.91) (  -0.09,-136.69)   25.66                80