Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 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)
 07/12/2023   08:03:48   (  -0.01,-104.73) (  -0.94,-100.50)  481.75                80
 07/13/2023   20:25:43   (   0.02,-104.72) (  -0.25,-105.80)  123.74                80
 07/14/2023   20:09:38   (   0.01,-104.72) (   0.76,-101.27)  393.10                80
 07/16/2023   08:31:25   (  -0.01,-104.74) (   0.37,-106.54)  205.60                80
 07/17/2023   08:10:00   (  -0.01,-104.74) (  -0.64,-102.01)  310.93                80
 07/18/2023   20:31:54   (   0.01,-104.72) (  -0.59,-107.30)  294.79                80
 07/19/2023   20:15:48   (   0.01,-104.72) (   0.42,-102.77)  222.33                80
 07/21/2023   08:37:36   (  -0.01,-104.75) (   0.71,-108.04)  375.31                80
 07/22/2023   08:16:10   (  -0.00,-104.75) (  -0.30,-103.51)  141.71                80
 07/23/2023   20:38:05   (   0.00,-104.73) (  -0.92,-108.80)  463.97                80
 07/24/2023   20:21:59   (   0.00,-104.74) (   0.10,-104.27)   53.30                80