Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 5 9.  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   20:25:55   (  -0.00,-104.72) (  -0.22,-105.77)  119.27                80
 05/11/2023   20:09:50   (  -0.01,-104.72) (   0.77,-101.24)  396.78                80
 05/13/2023   08:31:39   (   0.01,-104.71) (   0.41,-106.51)  204.86                80
 05/14/2023   08:10:14   (   0.02,-104.71) (  -0.59,-101.98)  311.08                80
 05/15/2023   20:32:11   (  -0.01,-104.71) (  -0.58,-107.29)  293.98                80
 05/16/2023   20:16:07   (  -0.01,-104.71) (   0.43,-102.76)  222.38                80
 05/18/2023   08:37:55   (  -0.00,-104.72) (   0.74,-108.04)  378.43                80
 05/19/2023   08:16:31   (  -0.00,-104.72) (  -0.26,-103.51)  137.54                80
 05/20/2023   20:38:28   (   0.01,-104.71) (  -0.89,-108.82)  468.24                80
 05/21/2023   20:22:24   (   0.01,-104.71) (   0.12,-104.29)   48.18                80