Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 19.  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)
 05/19/2023   22:39:07   (  -0.00,-137.00) (  -0.47,-139.04)  233.32                80
 05/20/2023   22:23:02   (   0.00,-137.00) (   0.53,-134.51)  282.48                80
 05/22/2023   10:42:11   (  -0.01,-137.00) (   0.63,-139.79)  318.78                80
 05/23/2023   10:26:06   (  -0.01,-136.99) (  -0.38,-135.26)  196.61                80
 05/24/2023   22:45:23   (   0.02,-136.97) (  -0.78,-140.57)  410.31                80
 05/25/2023   22:29:19   (   0.02,-136.96) (   0.23,-136.04)  104.93                80
 05/27/2023   10:48:27   (  -0.02,-136.96) (   0.93,-141.32)  496.91                80
 05/28/2023   10:32:23   (  -0.02,-136.95) (  -0.08,-136.79)   18.40                80
 05/30/2023   22:32:55   (   0.03,-136.91) (  -0.11,-137.57)   74.56                80
 05/31/2023   22:16:50   (   0.03,-136.89) (   0.90,-133.04)  439.99                80