Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-18)   GOES-18 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 06/23/2023   10:42:08   (  -0.01,-137.02) (   0.63,-139.82)  319.98                80
 06/24/2023   10:26:03   (  -0.00,-137.02) (  -0.41,-135.30)  196.76                80
 06/25/2023   22:45:19   (  -0.00,-137.01) (  -0.80,-140.59)  408.84                80
 06/26/2023   22:29:13   (  -0.00,-137.00) (   0.19,-136.06)  107.50                80
 06/28/2023   10:48:20   (  -0.00,-137.01) (   0.96,-141.33)  492.74                80
 06/29/2023   10:32:15   (  -0.01,-137.00) (  -0.03,-136.79)   22.96                80
 07/01/2023   22:32:46   (   0.02,-136.96) (  -0.12,-137.57)   69.62                80
 07/02/2023   22:16:40   (   0.02,-136.94) (   0.88,-133.03)  445.23                80
 07/04/2023   10:35:47   (  -0.01,-136.92) (   0.32,-138.30)  157.04                80
 07/05/2023   10:19:41   (  -0.01,-136.90) (  -0.68,-133.76)  357.60                80
 07/06/2023   22:38:56   (   0.00,-136.86) (  -0.50,-139.06)  250.99                80