Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 14.  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)
 01/14/2023   10:46:06   (  -0.02,-136.89) (   0.66,-139.81)  334.09                80
 01/15/2023   10:24:42   (  -0.02,-136.87) (  -0.38,-135.29)  180.82                80
 01/16/2023   22:46:37   (   0.02,-136.84) (  -0.83,-140.59)  428.10                80
 01/17/2023   22:30:32   (   0.03,-136.82) (   0.22,-136.07)   86.25                80
 01/20/2023   10:33:34   (  -0.04,-136.78) (  -0.05,-136.81)    3.77                80
 01/22/2023   22:34:04   (   0.04,-136.69) (  -0.15,-137.58)  100.31                80
 01/23/2023   22:17:59   (   0.04,-136.67) (   0.85,-133.04)  413.26                80
 01/25/2023   10:37:05   (  -0.05,-136.64) (   0.35,-138.30)  190.26                80
 01/26/2023   10:20:59   (  -0.05,-136.61) (  -0.65,-133.77)  323.24                80
 01/27/2023   22:40:15   (   0.05,-136.55) (  -0.53,-139.08)  287.94                80