Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 5 12.  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)
 05/13/2023   08:31:38   (   0.00,-104.72) (   0.42,-106.51)  204.24                80
 05/14/2023   08:10:14   (   0.00,-104.72) (  -0.58,-101.98)  311.97                80
 05/15/2023   20:32:11   (  -0.00,-104.73) (  -0.58,-107.29)  292.24                80
 05/16/2023   20:16:07   (  -0.00,-104.73) (   0.42,-102.76)  224.51                80
 05/18/2023   08:37:55   (   0.00,-104.74) (   0.75,-108.03)  375.75                80
 05/19/2023   08:16:31   (   0.00,-104.74) (  -0.26,-103.50)  140.59                80
 05/20/2023   20:38:28   (   0.00,-104.74) (  -0.90,-108.82)  464.24                80
 05/21/2023   20:22:23   (   0.00,-104.75) (   0.11,-104.29)   52.32                80
 05/24/2023   08:25:27   (  -0.02,-104.76) (   0.03,-105.04)   31.39                80
 05/25/2023   08:04:03   (  -0.02,-104.76) (  -0.99,-100.51)  485.10                80