Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 16.  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)
 05/17/2023   10:38:35   (   0.00,-137.01) (   0.26,-138.27)  143.21                80
 05/18/2023   10:17:11   (   0.00,-137.02) (  -0.75,-133.74)  373.50                80
 05/19/2023   22:41:47   (   0.00,-137.02) (  -0.47,-139.04)  231.62                80
 05/20/2023   22:20:23   (   0.01,-137.02) (   0.59,-134.53)  284.56                80
 05/22/2023   10:44:51   (  -0.02,-137.02) (   0.63,-139.79)  316.19                80
 05/23/2023   10:26:07   (  -0.02,-137.02) (  -0.44,-135.27)  199.71                80
 05/24/2023   22:45:23   (   0.02,-137.01) (  -0.77,-140.58)  406.43                80
 05/25/2023   22:29:19   (   0.02,-137.00) (   0.24,-136.05)  109.34                80
 05/27/2023   10:48:26   (  -0.02,-137.00) (   0.97,-141.31)  491.90                80
 05/28/2023   10:32:22   (  -0.02,-137.00) (  -0.04,-136.78)   23.82                80