Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 10.  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   22:33:06   (  -0.00,-137.00) (  -0.14,-137.53)   61.25                80
 04/13/2023   22:17:00   (  -0.00,-137.00) (   0.86,-132.99)  455.64                80
 04/15/2023   10:38:45   (   0.01,-137.00) (   0.31,-138.26)  143.79                80
 04/16/2023   10:17:19   (   0.01,-136.99) (  -0.70,-133.72)  372.84                80
 04/17/2023   22:39:13   (  -0.01,-136.98) (  -0.44,-139.02)  232.15                80
 04/18/2023   22:23:07   (  -0.01,-136.98) (   0.57,-134.49)  284.42                80
 04/20/2023   10:44:51   (   0.01,-136.97) (   0.64,-139.74)  315.45                80
 04/21/2023   10:23:24   (   0.01,-136.96) (  -0.37,-135.20)  200.70                80
 04/22/2023   22:45:18   (  -0.01,-136.94) (  -0.81,-140.49)  405.15                80
 04/23/2023   22:29:11   (  -0.02,-136.93) (   0.21,-135.96)  110.88                80