Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 8 20.  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)
 08/20/2023   20:15:19   (  -0.01,-104.69) (   0.47,-102.69)  229.08                80
 08/22/2023   08:37:07   (   0.01,-104.72) (   0.75,-107.96)  369.46                80
 08/23/2023   08:15:44   (   0.01,-104.72) (  -0.30,-103.44)  146.27                80
 08/24/2023   20:37:40   (  -0.01,-104.68) (  -0.94,-108.73)  462.13                80
 08/25/2023   20:21:37   (  -0.01,-104.68) (   0.10,-104.21)   53.62                80
 08/28/2023   08:24:41   (   0.02,-104.70) (   0.05,-104.96)   29.89                80
 08/29/2023   08:03:17   (   0.02,-104.69) (  -0.94,-100.43)  485.64                80
 08/30/2023   20:25:13   (  -0.03,-104.66) (  -0.29,-105.73)  123.01                80
 08/31/2023   20:09:10   (  -0.03,-104.65) (   0.76,-101.21)  392.91                80
 09/02/2023   08:30:58   (   0.03,-104.68) (   0.43,-106.48)  205.03                80