Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 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)
 01/12/2023   22:24:19   (   0.02,-136.89) (   0.54,-134.55)  267.02                80
 01/14/2023   10:46:06   (  -0.02,-136.89) (   0.64,-139.82)  334.10                80
 01/15/2023   10:24:41   (  -0.02,-136.87) (  -0.35,-135.28)  180.81                80
 01/16/2023   22:46:37   (   0.02,-136.84) (  -0.81,-140.60)  428.14                80
 01/17/2023   22:30:32   (   0.03,-136.82) (   0.18,-136.06)   86.18                80
 01/20/2023   10:30:54   (  -0.04,-136.78) (  -0.01,-136.80)    3.79                80
 01/22/2023   22:34:04   (   0.04,-136.69) (  -0.13,-137.58)  100.44                80
 01/23/2023   22:17:59   (   0.04,-136.67) (   0.87,-133.05)  413.14                80
 01/25/2023   10:37:05   (  -0.05,-136.64) (   0.34,-138.31)  190.40                80
 01/26/2023   10:21:00   (  -0.05,-136.61) (  -0.66,-133.77)  323.06                80