Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 8.  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)
 01/09/2023   10:39:53   (  -0.01,-136.93) (   0.27,-138.31)  156.54                80
 01/10/2023   10:18:28   (  -0.01,-136.92) (  -0.70,-133.77)  358.96                80
 01/11/2023   22:40:24   (   0.01,-136.90) (  -0.47,-139.08)  248.44                80
 01/12/2023   22:24:19   (   0.02,-136.89) (   0.51,-134.54)  266.99                80
 01/14/2023   10:46:06   (  -0.02,-136.89) (   0.66,-139.81)  334.20                80
 01/15/2023   10:24:42   (  -0.02,-136.87) (  -0.38,-135.29)  180.68                80
 01/16/2023   22:46:37   (   0.02,-136.84) (  -0.84,-140.59)  428.29                80
 01/17/2023   22:30:32   (   0.03,-136.82) (   0.20,-136.07)   86.01                80
 01/20/2023   10:30:54   (  -0.04,-136.78) (  -0.02,-136.80)    3.54                80