Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 10 15.  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)
 10/15/2023   22:44:34   (   0.01,-137.00) (  -0.75,-140.53)  402.09                80
 10/16/2023   22:28:28   (   0.01,-136.99) (   0.21,-135.98)  114.18                80
 10/18/2023   10:50:14   (   0.01,-136.98) (   0.96,-141.25)  486.23                80
 10/19/2023   10:28:49   (   0.01,-136.97) (  -0.07,-136.72)   29.22                80
 10/21/2023   22:34:37   (  -0.00,-136.92) (  -0.13,-137.48)   62.76                80
 10/22/2023   22:13:12   (   0.00,-136.91) (   0.91,-132.94)  452.09                80
 10/24/2023   10:37:37   (   0.00,-136.88) (   0.30,-138.20)  150.09                80
 10/25/2023   10:16:12   (  -0.00,-136.86) (  -0.74,-133.67)  364.71                80
 10/26/2023   22:40:46   (  -0.01,-136.83) (  -0.46,-138.96)  242.61                80
 10/27/2023   22:19:20   (  -0.01,-136.81) (   0.53,-134.42)  272.19                80
 10/29/2023   10:43:45   (   0.03,-136.78) (   0.67,-139.68)  330.44                80