Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 16.  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)
 07/17/2023   22:32:34   (  -0.01,-136.98) (  -0.11,-137.54)   63.04                80
 07/18/2023   22:16:29   (  -0.01,-136.98) (   0.90,-133.01)  452.93                80
 07/20/2023   10:38:15   (   0.02,-136.96) (   0.28,-138.27)  148.99                80
 07/21/2023   10:16:49   (   0.02,-136.95) (  -0.67,-133.73)  366.71                80
 07/22/2023   22:38:44   (  -0.02,-136.94) (  -0.49,-139.03)  238.71                80
 07/23/2023   22:22:39   (  -0.02,-136.92) (   0.53,-134.50)  276.72                80
 07/25/2023   10:44:25   (   0.03,-136.90) (   0.66,-139.76)  326.02                80
 07/26/2023   10:22:59   (   0.03,-136.88) (  -0.36,-135.23)  188.90                80
 07/27/2023   22:44:54   (  -0.03,-136.86) (  -0.85,-140.52)  417.97                80
 07/28/2023   22:28:48   (  -0.03,-136.83) (   0.18,-135.99)   96.38                80