Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 5 10.  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)
 05/10/2023   20:27:19   (   0.00,-104.72) (   0.00,-105.82)  121.66                 0
 05/11/2023   20:09:50   (   0.00,-104.73) (   0.76,-101.23)  397.49                80
 05/13/2023   08:31:38   (  -0.00,-104.72) (   0.42,-106.51)  203.90                80
 05/14/2023   08:10:15   (  -0.00,-104.72) (  -0.64,-101.99)  312.37                80
 05/15/2023   20:32:11   (   0.00,-104.73) (  -0.58,-107.29)  291.63                80
 05/16/2023   20:16:07   (   0.00,-104.74) (   0.42,-102.76)  225.14                80
 05/18/2023   08:37:55   (  -0.01,-104.75) (   0.74,-108.04)  375.18                80
 05/19/2023   08:16:31   (  -0.01,-104.75) (  -0.27,-103.51)  141.12                80
 05/20/2023   20:38:28   (   0.01,-104.75) (  -0.88,-108.82)  463.59                80
 05/21/2023   20:22:23   (   0.02,-104.76) (   0.13,-104.29)   53.05                80
 05/24/2023   08:25:26   (  -0.02,-104.77) (   0.06,-105.03)   30.38                80