Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 16.  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)
 07/16/2023   08:31:25   (  -0.02,-104.73) (   0.36,-106.55)  206.52                80
 07/17/2023   08:10:00   (  -0.02,-104.72) (  -0.66,-102.01)  309.71                80
 07/18/2023   20:31:54   (   0.03,-104.71) (  -0.58,-107.30)  296.25                80
 07/19/2023   20:15:49   (   0.03,-104.71) (   0.44,-102.77)  220.53                80
 07/21/2023   08:37:36   (  -0.04,-104.73) (   0.69,-108.05)  377.96                80
 07/22/2023   08:16:10   (  -0.03,-104.73) (  -0.33,-103.51)  138.72                80
 07/23/2023   20:38:05   (   0.04,-104.71) (  -0.89,-108.81)  467.16                80
 07/24/2023   20:21:59   (   0.04,-104.71) (   0.12,-104.27)   49.82                80
 07/27/2023   08:25:00   (  -0.05,-104.73) (   0.04,-105.01)   31.83                80
 07/28/2023   08:03:35   (  -0.05,-104.73) (  -0.98,-100.47)  484.54                80
 07/29/2023   20:25:30   (   0.06,-104.70) (  -0.16,-105.78)  122.40                80