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)  143.32                80
 05/18/2023   10:17:10   (  -0.00,-137.01) (  -0.74,-133.74)  373.29                80
 05/19/2023   22:41:47   (   0.00,-137.01) (  -0.48,-139.04)  232.14                80
 05/20/2023   22:20:23   (   0.01,-137.01) (   0.59,-134.53)  283.93                80
 05/22/2023   10:42:12   (  -0.02,-137.02) (   0.58,-139.80)  316.82                80
 05/23/2023   10:26:07   (  -0.02,-137.01) (  -0.43,-135.27)  198.97                80
 05/24/2023   22:45:23   (   0.02,-137.00) (  -0.78,-140.57)  407.44                80
 05/25/2023   22:29:19   (   0.02,-137.00) (   0.23,-136.04)  108.20                80
 05/27/2023   10:48:27   (  -0.02,-136.99) (   0.93,-141.32)  493.07                80
 05/28/2023   10:32:23   (  -0.02,-136.99) (  -0.09,-136.79)   22.49                80