Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 21.  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)
 06/21/2023   22:23:01   (   0.01,-137.00) (   0.54,-134.55)  279.15                80
 06/23/2023   10:42:08   (  -0.00,-137.02) (   0.62,-139.82)  319.78                80
 06/24/2023   10:26:03   (   0.00,-137.02) (  -0.37,-135.29)  196.90                80
 06/25/2023   22:45:19   (  -0.00,-137.00) (  -0.79,-140.60)  408.87                80
 06/26/2023   22:29:13   (  -0.01,-137.00) (   0.20,-136.06)  107.45                80
 06/28/2023   10:48:21   (   0.00,-137.01) (   0.95,-141.33)  492.70                80
 06/29/2023   10:32:15   (   0.00,-137.00) (  -0.04,-136.80)   22.99                80
 07/01/2023   22:32:46   (   0.01,-136.96) (  -0.11,-137.57)   69.53                80
 07/02/2023   22:16:41   (   0.00,-136.94) (   0.89,-133.04)  445.36                80
 07/04/2023   10:35:47   (  -0.01,-136.92) (   0.31,-138.30)  156.99                80
 07/05/2023   10:19:41   (  -0.00,-136.90) (  -0.69,-133.76)  357.60                80