Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 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)
 07/13/2023   20:25:43   (   0.01,-104.69) (  -0.25,-105.80)  127.30                80
 07/14/2023   20:09:38   (   0.01,-104.66) (   0.76,-101.27)  386.29                80
 07/16/2023   08:31:24   (  -0.01,-104.62) (   0.44,-106.53)  218.24                80
 07/17/2023   08:09:58   (  -0.01,-104.59) (  -0.57,-102.00)  295.10                80
 07/18/2023   20:31:54   (   0.01,-104.54) (  -0.60,-107.30)  314.57                80
 07/19/2023   20:15:48   (   0.01,-104.51) (   0.41,-102.77)  199.26                80
 07/21/2023   08:37:35   (  -0.01,-104.48) (   0.78,-108.03)  404.32                80
 07/22/2023   08:16:09   (  -0.01,-104.45) (  -0.24,-103.50)  109.37                80
 07/24/2023   20:21:58   (   0.01,-104.38) (   0.04,-104.26)   13.69                80