Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 6.  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)
 07/06/2023   08:16:21   (   0.00,-104.72) (  -0.23,-103.52)  135.91                80
 07/07/2023   20:38:18   (  -0.00,-104.71) (  -0.90,-108.84)  470.14                80
 07/08/2023   20:22:12   (   0.00,-104.71) (   0.10,-104.30)   46.84                80
 07/11/2023   08:25:13   (   0.00,-104.74) (   0.09,-105.03)   34.12                80
 07/12/2023   08:03:49   (   0.00,-104.74) (  -0.97,-100.51)  482.71                80
 07/13/2023   20:25:43   (  -0.01,-104.72) (  -0.27,-105.80)  123.18                80
 07/14/2023   20:09:37   (  -0.01,-104.73) (   0.74,-101.26)  393.88                80
 07/16/2023   08:31:25   (   0.01,-104.75) (   0.40,-106.54)  203.61                80
 07/17/2023   08:09:59   (   0.01,-104.75) (  -0.61,-102.01)  313.07                80
 07/18/2023   20:31:54   (  -0.01,-104.73) (  -0.56,-107.31)  293.33                80
 07/19/2023   20:15:49   (  -0.01,-104.74) (   0.46,-102.78)  223.90                80