Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 5 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 05/27/2023   20:09:54   (  -0.00,-104.71) (   0.76,-101.27)  391.76                80
 05/29/2023   08:31:43   (   0.00,-104.72) (   0.39,-106.55)  208.34                80
 05/30/2023   08:10:17   (   0.00,-104.72) (  -0.57,-102.01)  307.89                80
 05/31/2023   20:32:15   (  -0.01,-104.71) (  -0.58,-107.33)  297.63                80
 06/01/2023   20:16:10   (  -0.01,-104.71) (   0.44,-102.80)  218.81                80
 06/03/2023   08:37:57   (   0.01,-104.72) (   0.75,-108.07)  381.07                80
 06/04/2023   08:16:33   (   0.02,-104.72) (  -0.27,-103.54)  134.75                80
 06/05/2023   20:38:29   (  -0.02,-104.70) (  -0.93,-108.84)  472.10                80
 06/06/2023   20:22:24   (  -0.02,-104.69) (   0.04,-104.30)   43.86                80
 06/09/2023   08:25:28   (   0.02,-104.69) (   0.07,-105.06)   40.61                80