Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 9.  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)
 04/09/2023   10:51:25   (   0.00,-136.99) (   0.99,-141.30)  492.33                80
 04/10/2023   10:30:00   (   0.00,-136.98) (  -0.07,-136.78)   23.68                80
 04/12/2023   22:33:06   (  -0.00,-136.94) (  -0.15,-137.53)   67.12                80
 04/13/2023   22:17:00   (  -0.00,-136.93) (   0.86,-132.99)  448.24                80
 04/15/2023   10:38:45   (   0.01,-136.91) (   0.31,-138.25)  153.79                80
 04/16/2023   10:17:19   (   0.01,-136.89) (  -0.70,-133.72)  361.36                80
 04/17/2023   22:39:12   (  -0.00,-136.86) (  -0.50,-139.01)  245.51                80
 04/18/2023   22:23:06   (  -0.00,-136.84) (   0.51,-134.47)  269.56                80
 04/20/2023   10:44:51   (   0.00,-136.81) (   0.65,-139.74)  332.93                80
 04/21/2023   10:23:24   (  -0.00,-136.79) (  -0.37,-135.20)  181.68                80
 04/22/2023   22:45:18   (   0.02,-136.75) (  -0.81,-140.49)  426.63                80