Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 12 12.  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)
 12/12/2023   10:19:59   (   0.01,-137.00) (  -0.70,-133.93)  350.46                80
 12/13/2023   22:39:16   (  -0.01,-137.00) (  -0.50,-139.23)  254.68                80
 12/14/2023   22:23:11   (  -0.01,-137.00) (   0.51,-134.70)  261.55                80
 12/16/2023   10:42:20   (   0.02,-137.00) (   0.67,-139.97)  338.80                80
 12/17/2023   10:23:35   (   0.01,-136.99) (  -0.34,-135.44)  176.95                80
 12/18/2023   22:48:11   (  -0.00,-136.98) (  -0.86,-140.74)  429.33                80
 12/19/2023   22:26:47   (   0.01,-136.97) (   0.15,-136.21)   86.29                80
 12/22/2023   10:32:31   (  -0.00,-136.96) (   0.01,-136.95)    1.29                80
 12/24/2023   22:35:43   (  -0.02,-136.92) (  -0.18,-137.72)   90.72                80
 12/25/2023   22:14:18   (  -0.02,-136.91) (   0.84,-133.19)  424.06                80