Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 13.  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)
 06/14/2023   08:31:41   (  -0.01,-104.72) (   0.42,-106.56)  210.64                80
 06/15/2023   08:10:17   (  -0.01,-104.72) (  -0.61,-102.04)  305.48                80
 06/16/2023   20:32:13   (   0.01,-104.71) (  -0.57,-107.34)  300.07                80
 06/17/2023   20:16:08   (   0.01,-104.71) (   0.41,-102.81)  216.27                80
 06/19/2023   08:37:55   (  -0.01,-104.71) (   0.76,-108.08)  383.58                80
 06/20/2023   08:16:30   (  -0.02,-104.71) (  -0.28,-103.55)  132.48                80
 06/21/2023   20:38:27   (   0.02,-104.70) (  -0.89,-108.86)  473.37                80
 06/22/2023   20:22:21   (   0.01,-104.70) (   0.10,-104.32)   43.40                80
 06/25/2023   08:25:23   (   0.00,-104.72) (   0.09,-105.05)   38.60                80
 06/26/2023   08:03:59   (   0.01,-104.72) (  -0.96,-100.53)  478.04                80