Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 3 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)
 03/16/2023   22:41:25   (   0.01,-137.00) (   0.00,-139.24)  248.79                 0
 03/17/2023   22:23:51   (   0.01,-137.00) (   0.54,-134.60)  273.13                80
 03/19/2023   10:45:38   (  -0.01,-136.99) (   0.64,-139.87)  327.93                80
 03/20/2023   10:24:12   (  -0.01,-136.99) (  -0.38,-135.33)  188.11                80
 03/21/2023   22:46:08   (   0.01,-136.98) (  -0.78,-140.64)  417.31                80
 03/22/2023   22:30:01   (   0.01,-136.97) (   0.18,-136.10)   98.73                80
 03/25/2023   10:33:02   (  -0.01,-136.95) (  -0.04,-136.84)   12.89                80
 03/27/2023   22:33:31   (   0.02,-136.91) (  -0.13,-137.60)   78.58                80
 03/28/2023   22:17:24   (   0.02,-136.90) (   0.85,-133.06)  436.41                80
 03/30/2023   10:36:31   (  -0.03,-136.87) (   0.31,-138.33)  166.44                80