Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 4.  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)
 09/04/2023   22:16:07   (  -0.00,-136.98) (   0.92,-132.97)  457.44                80
 09/06/2023   10:35:15   (   0.00,-136.96) (   0.26,-138.25)  146.04                80
 09/07/2023   10:19:11   (   0.01,-136.94) (  -0.74,-133.71)  368.10                80
 09/08/2023   22:38:27   (  -0.01,-136.90) (  -0.48,-139.02)  240.56                80
 09/09/2023   22:22:22   (  -0.01,-136.88) (   0.53,-134.48)  273.26                80
 09/11/2023   10:41:31   (   0.01,-136.85) (   0.64,-139.76)  331.00                80
 09/12/2023   10:25:26   (   0.02,-136.83) (  -0.37,-135.23)  182.70                80
 09/13/2023   22:47:23   (  -0.02,-136.79) (  -0.84,-140.53)  426.48                80
 09/14/2023   22:25:58   (  -0.02,-136.76) (   0.17,-136.00)   86.99                80
 09/17/2023   10:31:41   (   0.02,-136.70) (   0.03,-136.74)    4.88                80