Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 13.  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)
 04/13/2023   22:17:00   (  -0.00,-137.00) (   0.90,-133.00)  455.83                80
 04/15/2023   10:38:46   (   0.00,-137.00) (   0.27,-138.26)  143.68                80
 04/16/2023   10:17:19   (   0.00,-137.00) (  -0.74,-133.72)  373.05                80
 04/17/2023   22:39:13   (  -0.00,-136.99) (  -0.46,-139.02)  231.58                80
 04/18/2023   22:23:06   (  -0.00,-136.98) (   0.56,-134.48)  285.08                80
 04/20/2023   10:44:51   (   0.00,-136.98) (   0.60,-139.75)  314.82                80
 04/21/2023   10:23:25   (   0.00,-136.97) (  -0.42,-135.21)  201.45                80
 04/22/2023   22:45:17   (  -0.00,-136.95) (  -0.82,-140.49)  404.26                80
 04/23/2023   22:29:11   (  -0.01,-136.94) (   0.20,-135.96)  111.73                80
 04/25/2023   10:48:15   (   0.02,-136.92) (   1.00,-141.21)  488.92                80
 04/26/2023   10:32:09   (   0.02,-136.91) (  -0.03,-136.67)   26.59                80