Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 10 20.  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)
 10/21/2023   22:32:07   (   0.00,-137.00) (  -0.11,-137.52)   58.79                80
 10/22/2023   22:16:05   (   0.00,-137.00) (   0.92,-133.00)  456.22                80
 10/24/2023   10:35:15   (  -0.00,-137.00) (   0.27,-138.28)  145.59                80
 10/25/2023   10:19:12   (  -0.00,-136.99) (  -0.70,-133.75)  369.32                80
 10/26/2023   22:38:31   (   0.00,-136.97) (  -0.48,-139.06)  238.68                80
 10/27/2023   22:22:29   (   0.00,-136.96) (   0.55,-134.54)  276.02                80
 10/29/2023   10:41:39   (   0.00,-136.96) (   0.63,-139.82)  326.50                80
 10/30/2023   10:25:36   (   0.00,-136.95) (  -0.35,-135.29)  187.78                80
 10/31/2023   22:44:55   (  -0.00,-136.91) (  -0.83,-140.61)  421.35                80
 11/01/2023   22:28:51   (  -0.02,-136.90) (   0.15,-136.08)   92.85                80