Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 12 30.  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)
 12/30/2023   22:23:10   (  -0.02,-136.98) (   0.48,-134.68)  261.97                80
 01/01/2024   10:44:59   (   0.01,-136.99) (   0.65,-139.96)  337.99                80
 01/02/2024   10:23:33   (  -0.00,-136.99) (  -0.33,-135.42)  177.96                80
 01/03/2024   22:48:09   (   0.01,-136.97) (  -0.83,-140.73)  428.14                80
 01/04/2024   22:29:24   (   0.01,-136.96) (   0.16,-136.19)   87.77                80
 01/07/2024   10:29:46   (   0.02,-136.94) (   0.03,-136.91)    3.66                80
 01/09/2024   22:32:57   (  -0.01,-136.89) (  -0.18,-137.68)   90.33                80
 01/10/2024   22:16:51   (  -0.01,-136.87) (   0.81,-133.14)  424.12                80
 01/12/2024   10:38:39   (   0.01,-136.84) (   0.35,-138.41)  178.57                80
 01/13/2024   10:17:13   (   0.01,-136.82) (  -0.64,-133.87)  335.53                80