Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 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)
 05/09/2023   22:29:14   (   0.00,-137.00) (   0.26,-136.00)  114.40                80
 05/11/2023   10:48:22   (   0.00,-137.00) (   0.99,-141.26)  486.57                80
 05/12/2023   10:32:18   (   0.01,-137.00) (  -0.07,-136.74)   29.39                80
 05/14/2023   22:32:50   (  -0.02,-136.99) (  -0.16,-137.51)   60.97                80
 05/15/2023   22:16:46   (  -0.02,-136.98) (   0.90,-133.00)  454.82                80
 05/17/2023   10:35:55   (   0.01,-136.98) (   0.27,-138.27)  147.03                80
 05/18/2023   10:19:50   (   0.00,-136.97) (  -0.73,-133.74)  368.20                80
 05/19/2023   22:39:07   (   0.01,-136.95) (  -0.48,-139.04)  239.09                80
 05/20/2023   22:23:02   (   0.00,-136.94) (   0.53,-134.51)  275.88                80
 05/22/2023   10:42:10   (  -0.01,-136.92) (   0.64,-139.79)  326.97                80
 05/23/2023   10:26:06   (  -0.00,-136.91) (  -0.38,-135.26)  187.66                80