Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 9 12.  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)
 09/13/2023   08:24:48   (  -0.01,-104.71) (   0.05,-105.00)   33.79                80
 09/14/2023   08:03:23   (  -0.01,-104.71) (  -0.96,-100.47)  482.44                80
 09/15/2023   20:25:20   (   0.00,-104.69) (  -0.25,-105.78)  124.05                80
 09/16/2023   20:09:15   (   0.00,-104.69) (   0.76,-101.25)  392.53                80
 09/18/2023   08:31:03   (  -0.00,-104.72) (   0.39,-106.52)  205.81                80
 09/19/2023   08:09:39   (  -0.00,-104.71) (  -0.63,-101.99)  310.31                80
 09/20/2023   20:31:35   (   0.01,-104.69) (  -0.57,-107.30)  297.23                80
 09/21/2023   20:15:31   (   0.01,-104.69) (   0.45,-102.77)  218.77                80
 09/23/2023   08:37:18   (  -0.02,-104.71) (   0.75,-108.04)  379.99                80
 09/24/2023   08:15:54   (  -0.02,-104.70) (  -0.27,-103.51)  135.70                80
 09/25/2023   20:37:50   (   0.01,-104.67) (  -0.91,-108.81)  472.49                80