Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 12.  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)
 05/14/2023   22:32:51   (  -0.02,-136.99) (  -0.11,-137.52)   60.47                80
 05/15/2023   22:16:46   (  -0.02,-136.98) (   0.89,-132.99)  455.35                80
 05/17/2023   10:38:34   (   0.02,-136.98) (   0.34,-138.26)  146.52                80
 05/18/2023   10:19:50   (  -0.00,-136.97) (  -0.73,-133.74)  368.17                80
 05/19/2023   22:39:07   (   0.01,-136.95) (  -0.43,-139.05)  238.71                80
 05/20/2023   22:23:03   (   0.01,-136.94) (   0.58,-134.52)  276.36                80
 05/22/2023   10:42:10   (  -0.01,-136.92) (   0.64,-139.79)  326.64                80
 05/23/2023   10:26:06   (  -0.00,-136.91) (  -0.37,-135.26)  188.05                80
 05/24/2023   22:45:22   (   0.00,-136.88) (  -0.83,-140.56)  419.69                80
 05/25/2023   22:29:18   (  -0.01,-136.86) (   0.19,-136.03)   94.86                80