Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 9 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)
 09/20/2023   20:31:34   (  -0.02,-104.68) (  -0.62,-107.28)  297.10                80
 09/21/2023   20:15:30   (  -0.01,-104.68) (   0.40,-102.76)  218.87                80
 09/23/2023   08:37:18   (   0.00,-104.70) (   0.73,-108.04)  379.40                80
 09/24/2023   08:15:54   (  -0.01,-104.70) (  -0.29,-103.51)  135.92                80
 09/25/2023   20:37:50   (   0.01,-104.66) (  -0.90,-108.81)  472.69                80
 09/26/2023   20:21:45   (   0.01,-104.66) (   0.07,-104.27)   43.69                80
 09/29/2023   08:24:47   (  -0.00,-104.69) (   0.07,-105.02)   37.19                80
 09/30/2023   08:03:23   (   0.00,-104.69) (  -0.96,-100.49)  479.13                80
 10/01/2023   20:25:18   (  -0.00,-104.66) (  -0.27,-105.78)  128.86                80
 10/02/2023   20:09:14   (  -0.01,-104.66) (   0.77,-101.26)  387.77                80