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)
 07/17/2023   08:09:59   (  -0.02,-104.72) (  -0.61,-102.00)  309.78                80
 07/18/2023   20:31:54   (   0.03,-104.71) (  -0.57,-107.31)  296.16                80
 07/19/2023   20:15:49   (   0.03,-104.71) (   0.45,-102.77)  220.58                80
 07/21/2023   08:37:35   (  -0.03,-104.73) (   0.74,-108.04)  377.95                80
 07/22/2023   08:16:10   (  -0.03,-104.73) (  -0.28,-103.50)  138.74                80
 07/23/2023   20:38:05   (   0.03,-104.71) (  -0.88,-108.81)  467.16                80
 07/24/2023   20:21:59   (   0.03,-104.71) (   0.14,-104.28)   49.80                80
 07/27/2023   08:25:00   (  -0.04,-104.73) (   0.03,-105.01)   31.80                80
 07/28/2023   08:03:35   (  -0.04,-104.73) (  -1.00,-100.48)  484.48                80
 07/29/2023   20:25:29   (   0.05,-104.70) (  -0.21,-105.77)  122.45                80