Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 10.  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)
 07/11/2023   08:25:13   (  -0.01,-104.73) (   0.08,-105.03)   34.76                80
 07/12/2023   08:03:49   (  -0.01,-104.73) (  -0.99,-100.51)  481.79                80
 07/13/2023   20:25:43   (   0.01,-104.72) (  -0.26,-105.80)  123.64                80
 07/14/2023   20:09:39   (   0.01,-104.72) (   0.81,-101.28)  393.28                80
 07/16/2023   08:31:25   (  -0.01,-104.74) (   0.38,-106.54)  205.21                80
 07/17/2023   08:09:59   (  -0.01,-104.74) (  -0.63,-102.01)  311.36                80
 07/18/2023   20:31:55   (   0.01,-104.73) (  -0.55,-107.31)  294.38                80
 07/19/2023   20:15:49   (   0.01,-104.73) (   0.46,-102.78)  222.79                80
 07/21/2023   08:37:36   (  -0.01,-104.75) (   0.73,-108.04)  374.61                80
 07/22/2023   08:16:10   (  -0.00,-104.76) (  -0.28,-103.51)  142.44                80
 07/23/2023   20:38:05   (   0.00,-104.74) (  -0.88,-108.81)  463.29                80