Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 9 30.  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)
 10/01/2023   20:25:19   (   0.00,-104.69) (  -0.23,-105.79)  124.28                80
 10/02/2023   20:09:13   (   0.00,-104.70) (   0.75,-101.25)  392.59                80
 10/04/2023   08:31:01   (  -0.00,-104.72) (   0.40,-106.52)  205.00                80
 10/05/2023   08:09:35   (  -0.00,-104.72) (  -0.58,-101.98)  311.54                80
 10/06/2023   20:31:31   (   0.01,-104.70) (  -0.58,-107.29)  295.45                80
 10/07/2023   20:15:27   (   0.01,-104.70) (   0.47,-102.77)  221.44                80
 10/09/2023   08:37:13   (  -0.01,-104.74) (   0.73,-108.03)  375.34                80
 10/10/2023   08:15:48   (  -0.01,-104.74) (  -0.26,-103.49)  141.64                80
 10/11/2023   20:37:44   (   0.01,-104.72) (  -0.88,-108.80)  464.93                80
 10/12/2023   20:21:39   (   0.00,-104.72) (   0.12,-104.27)   52.47                80