Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 5 4.  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)
 05/04/2023   20:39:56   (   0.00,-104.73) (   0.00,-108.97)  470.99                 0
 05/05/2023   20:22:17   (  -0.00,-104.73) (   0.10,-104.24)   56.41                80
 05/08/2023   08:25:22   (   0.00,-104.72) (   0.05,-104.99)   29.90                80
 05/09/2023   08:03:57   (  -0.00,-104.71) (  -0.94,-100.45)  485.34                80
 05/10/2023   20:25:55   (   0.00,-104.71) (  -0.23,-105.77)  120.73                80
 05/11/2023   20:09:50   (   0.00,-104.70) (   0.76,-101.23)  394.86                80
 05/13/2023   08:31:38   (  -0.00,-104.70) (   0.43,-106.51)  206.69                80
 05/14/2023   08:10:15   (  -0.00,-104.69) (  -0.63,-101.99)  308.92                80
 05/15/2023   20:32:11   (   0.00,-104.69) (  -0.60,-107.29)  296.94                80
 05/16/2023   20:16:08   (   0.01,-104.69) (   0.46,-102.77)  219.16                80
 05/18/2023   08:37:56   (  -0.01,-104.69) (   0.72,-108.05)  381.41                80