Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 10.  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)
 09/11/2023   10:44:11   (   0.01,-136.99) (   0.65,-139.76)  315.38                80
 09/12/2023   10:22:46   (   0.02,-136.99) (  -0.36,-135.23)  200.27                80
 09/13/2023   22:44:44   (  -0.02,-136.98) (  -0.80,-140.54)  405.21                80
 09/14/2023   22:28:39   (  -0.02,-136.98) (   0.22,-136.01)  110.29                80
 09/16/2023   10:50:26   (   0.02,-136.96) (   1.00,-141.27)  492.17                80
 09/17/2023   10:29:02   (   0.02,-136.95) (  -0.01,-136.75)   22.93                80
 09/19/2023   22:32:14   (  -0.02,-136.92) (  -0.17,-137.52)   69.16                80
 09/20/2023   22:16:09   (  -0.02,-136.90) (   0.85,-132.99)  445.23                80
 09/22/2023   10:37:57   (   0.03,-136.86) (   0.35,-138.26)  159.13                80
 09/23/2023   10:16:32   (   0.03,-136.84) (  -0.67,-133.73)  354.61                80