Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 9.  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)
 06/10/2023   08:04:02   (   0.01,-104.71) (  -0.91,-100.51)  477.60                80
 06/11/2023   20:25:58   (  -0.01,-104.71) (  -0.28,-105.82)  127.45                80
 06/12/2023   20:09:54   (  -0.01,-104.71) (   0.76,-101.29)  389.35                80
 06/14/2023   08:31:41   (   0.01,-104.72) (   0.42,-106.56)  209.91                80
 06/15/2023   08:10:17   (   0.01,-104.72) (  -0.61,-102.04)  306.52                80
 06/16/2023   20:32:12   (  -0.01,-104.71) (  -0.62,-107.33)  299.05                80
 06/17/2023   20:16:08   (  -0.02,-104.72) (   0.41,-102.81)  217.67                80
 06/19/2023   08:37:55   (   0.02,-104.73) (   0.76,-108.08)  381.15                80
 06/20/2023   08:16:29   (   0.02,-104.73) (  -0.22,-103.54)  135.23                80
 06/21/2023   20:38:26   (  -0.02,-104.72) (  -0.94,-108.85)  470.84                80
 06/22/2023   20:22:21   (  -0.01,-104.72) (   0.10,-104.32)   46.11                80