Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 21.  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)
 07/22/2023   08:16:09   (   0.01,-104.72) (  -0.25,-103.50)  139.69                80
 07/23/2023   20:38:04   (  -0.01,-104.71) (  -0.91,-108.80)  466.42                80
 07/24/2023   20:21:59   (  -0.01,-104.71) (   0.11,-104.27)   50.46                80
 07/27/2023   08:25:00   (   0.02,-104.72) (   0.05,-105.00)   31.21                80
 07/28/2023   08:03:33   (   0.02,-104.72) (  -0.91,-100.46)  485.14                80
 07/29/2023   20:25:27   (  -0.02,-104.69) (  -0.29,-105.75)  121.87                80
 07/30/2023   20:09:22   (  -0.03,-104.68) (   0.74,-101.22)  394.47                80
 08/01/2023   08:31:08   (   0.03,-104.70) (   0.44,-106.49)  203.89                80
 08/02/2023   08:09:43   (   0.03,-104.69) (  -0.59,-101.95)  312.13                80
 08/03/2023   20:31:37   (  -0.04,-104.66) (  -0.60,-107.25)  295.15                80