Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 23.  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)
 06/25/2023   08:25:23   (   0.00,-104.73) (   0.07,-105.05)   37.46                80
 06/26/2023   08:03:57   (   0.00,-104.73) (  -0.92,-100.52)  479.06                80
 06/27/2023   20:25:54   (   0.00,-104.72) (  -0.24,-105.83)  126.32                80
 06/28/2023   20:09:48   (   0.01,-104.72) (   0.76,-101.29)  390.34                80
 06/30/2023   08:31:35   (  -0.01,-104.73) (   0.39,-106.57)  208.59                80
 07/01/2023   08:10:10   (  -0.01,-104.73) (  -0.60,-102.03)  307.58                80
 07/02/2023   20:32:05   (   0.00,-104.71) (  -0.59,-107.33)  298.97                80
 07/03/2023   20:16:00   (   0.00,-104.71) (   0.41,-102.79)  217.32                80
 07/05/2023   08:37:47   (  -0.00,-104.72) (   0.74,-108.07)  381.66                80
 07/06/2023   08:16:22   (  -0.00,-104.71) (  -0.27,-103.53)  134.39                80