Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 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)
 06/12/2023   20:09:54   (   0.01,-104.71) (   0.77,-101.30)  388.92                80
 06/14/2023   08:31:41   (  -0.02,-104.72) (   0.40,-106.57)  210.87                80
 06/15/2023   08:10:17   (  -0.02,-104.72) (  -0.63,-102.04)  305.43                80
 06/16/2023   20:32:13   (   0.02,-104.71) (  -0.55,-107.35)  300.14                80
 06/17/2023   20:16:08   (   0.02,-104.71) (   0.43,-102.81)  216.51                80
 06/19/2023   08:37:55   (  -0.02,-104.73) (   0.73,-108.08)  382.54                80
 06/20/2023   08:16:30   (  -0.01,-104.72) (  -0.25,-103.54)  133.96                80
 06/21/2023   20:38:26   (   0.01,-104.71) (  -0.92,-108.85)  471.87                80
 06/22/2023   20:22:20   (   0.00,-104.72) (   0.07,-104.31)   45.19                80
 06/25/2023   08:25:23   (   0.00,-104.74) (   0.05,-105.06)   36.18                80