Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 12.  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)
 04/12/2023   22:33:07   (   0.00,-137.00) (  -0.11,-137.54)   61.03                80
 04/13/2023   22:17:01   (  -0.00,-137.00) (   0.90,-133.00)  455.82                80
 04/15/2023   10:38:46   (   0.00,-137.00) (   0.27,-138.26)  143.71                80
 04/16/2023   10:17:19   (   0.00,-137.00) (  -0.74,-133.73)  372.98                80
 04/17/2023   22:39:13   (  -0.00,-136.99) (  -0.46,-139.02)  231.73                80
 04/18/2023   22:23:06   (   0.00,-136.98) (   0.55,-134.48)  284.90                80
 04/20/2023   10:44:51   (  -0.00,-136.98) (   0.60,-139.75)  315.01                80
 04/21/2023   10:23:25   (  -0.00,-136.97) (  -0.42,-135.21)  201.14                80
 04/22/2023   22:45:18   (   0.01,-136.95) (  -0.77,-140.50)  404.87                80
 04/23/2023   22:29:12   (   0.02,-136.94) (   0.25,-135.97)  110.85                80
 04/25/2023   10:50:56   (  -0.02,-136.92) (   0.95,-141.22)  490.30                80
 04/26/2023   10:32:10   (  -0.02,-136.91) (  -0.07,-136.69)   25.18                80