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   20:09:55   (   0.01,-104.71) (   0.76,-101.28)  391.57                80
 05/29/2023   08:31:43   (  -0.00,-104.72) (   0.38,-106.55)  208.48                80
 05/30/2023   08:10:18   (  -0.00,-104.72) (  -0.64,-102.03)  307.72                80
 05/31/2023   20:32:15   (   0.00,-104.71) (  -0.57,-107.33)  297.81                80
 06/01/2023   20:16:10   (   0.00,-104.71) (   0.45,-102.80)  218.55                80
 06/03/2023   08:37:58   (   0.00,-104.72) (   0.75,-108.07)  381.36                80
 06/04/2023   08:16:33   (   0.00,-104.72) (  -0.27,-103.54)  134.44                80
 06/05/2023   20:38:29   (  -0.01,-104.70) (  -0.93,-108.84)  472.29                80
 06/06/2023   20:22:25   (  -0.02,-104.69) (   0.10,-104.32)   43.75                80
 06/09/2023   08:25:28   (   0.02,-104.70) (   0.07,-105.06)   40.57                80
 06/10/2023   08:04:02   (   0.02,-104.69) (  -0.89,-100.52)  475.36                80