Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 29.  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)
 04/29/2023   22:13:57   (  -0.00,-136.99) (   0.88,-132.93)  461.95                80
 05/01/2023   10:38:27   (   0.00,-136.98) (   0.27,-138.21)  139.87                80
 05/02/2023   10:17:02   (   0.00,-136.97) (  -0.71,-133.68)  375.18                80
 05/03/2023   22:38:59   (  -0.00,-136.95) (  -0.47,-138.99)  232.24                80
 05/04/2023   22:22:56   (   0.00,-136.94) (   0.58,-134.47)  282.41                80
 05/06/2023   10:44:44   (  -0.00,-136.92) (   0.61,-139.74)  320.77                80
 05/07/2023   10:26:00   (  -0.00,-136.91) (  -0.38,-135.21)  193.23                80
 05/08/2023   22:45:16   (  -0.00,-136.87) (  -0.85,-140.51)  416.03                80
 05/09/2023   22:29:13   (  -0.00,-136.84) (   0.21,-135.99)   97.53                80
 05/12/2023   10:32:15   (   0.01,-136.78) (   0.02,-136.72)    6.50                80