Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 17.  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)
 07/18/2023   20:31:54   (   0.01,-104.71) (  -0.59,-107.30)  295.83                80
 07/19/2023   20:15:48   (   0.01,-104.71) (   0.42,-102.77)  220.93                80
 07/21/2023   08:37:36   (  -0.02,-104.73) (   0.70,-108.04)  377.60                80
 07/22/2023   08:16:10   (  -0.01,-104.72) (  -0.31,-103.51)  139.11                80
 07/23/2023   20:38:04   (   0.02,-104.71) (  -0.90,-108.80)  466.74                80
 07/24/2023   20:21:59   (   0.01,-104.71) (   0.12,-104.27)   50.24                80
 07/27/2023   08:25:00   (  -0.02,-104.73) (   0.04,-105.00)   31.33                80
 07/28/2023   08:03:34   (  -0.02,-104.72) (  -0.99,-100.47)  484.98                80
 07/29/2023   20:25:29   (   0.02,-104.70) (  -0.22,-105.77)  121.84                80
 07/30/2023   20:09:23   (   0.02,-104.69) (   0.81,-101.24)  394.54                80