Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 9 21.  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)
 09/21/2023   20:15:31   (   0.01,-104.68) (   0.45,-102.77)  218.61                80
 09/23/2023   08:37:18   (  -0.01,-104.71) (   0.74,-108.03)  379.31                80
 09/24/2023   08:15:54   (  -0.01,-104.71) (  -0.28,-103.51)  136.68                80
 09/25/2023   20:37:50   (   0.01,-104.67) (  -0.91,-108.81)  471.57                80
 09/26/2023   20:21:44   (   0.01,-104.67) (   0.07,-104.27)   44.99                80
 09/29/2023   08:24:47   (  -0.00,-104.70) (   0.08,-105.01)   35.57                80
 09/30/2023   08:03:23   (  -0.00,-104.70) (  -0.95,-100.49)  480.91                80
 10/01/2023   20:25:18   (   0.00,-104.67) (  -0.28,-105.78)  126.94                80
 10/02/2023   20:09:14   (  -0.00,-104.68) (   0.76,-101.26)  389.81                80
 10/04/2023   08:31:01   (   0.01,-104.71) (   0.41,-106.53)  206.74                80