Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 14.  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   22:32:50   (  -0.02,-136.99) (  -0.13,-137.52)   60.36                80
 05/15/2023   22:16:46   (  -0.02,-136.98) (   0.87,-132.99)  455.37                80
 05/17/2023   10:38:34   (   0.02,-136.98) (   0.30,-138.26)  146.47                80
 05/18/2023   10:19:50   (  -0.00,-136.97) (  -0.70,-133.73)  368.20                80
 05/19/2023   22:39:07   (   0.01,-136.95) (  -0.46,-139.05)  238.70                80
 05/20/2023   22:23:03   (   0.01,-136.94) (   0.55,-134.52)  276.33                80
 05/22/2023   10:42:11   (  -0.01,-136.92) (   0.61,-139.79)  326.67                80
 05/23/2023   10:26:05   (  -0.00,-136.91) (  -0.34,-135.25)  188.04                80
 05/24/2023   22:45:23   (   0.00,-136.88) (  -0.80,-140.57)  419.76                80
 05/25/2023   22:29:17   (  -0.01,-136.86) (   0.15,-136.03)   94.84                80