Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 20.  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)
 06/21/2023   20:38:26   (  -0.00,-104.72) (  -0.94,-108.85)  470.57                80
 06/22/2023   20:22:21   (  -0.00,-104.73) (   0.10,-104.32)   47.27                80
 06/25/2023   08:25:23   (  -0.00,-104.78) (   0.07,-105.06)   31.55                80
 06/26/2023   08:03:58   (  -0.00,-104.79) (  -0.97,-100.53)  486.22                80
 06/27/2023   20:25:54   (   0.00,-104.80) (  -0.24,-105.83)  117.83                80
 06/28/2023   20:09:49   (   0.00,-104.81) (   0.81,-101.30)  400.16                80
 06/30/2023   08:31:36   (  -0.00,-104.85) (   0.40,-106.56)  196.33                80
 07/01/2023   08:10:11   (   0.00,-104.85) (  -0.65,-102.04)  321.06                80
 07/02/2023   20:32:06   (   0.00,-104.85) (  -0.56,-107.34)  284.29                80
 07/03/2023   20:16:01   (   0.00,-104.85) (   0.44,-102.80)  233.11                80