Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 10.  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)
 01/11/2023   22:40:24   (   0.01,-136.90) (  -0.48,-139.07)  248.42                80
 01/12/2023   22:24:19   (   0.02,-136.89) (   0.56,-134.55)  267.01                80
 01/14/2023   10:46:07   (  -0.02,-136.89) (   0.62,-139.82)  334.13                80
 01/15/2023   10:24:41   (  -0.02,-136.87) (  -0.36,-135.29)  180.75                80
 01/16/2023   22:46:38   (   0.02,-136.84) (  -0.79,-140.60)  428.19                80
 01/17/2023   22:30:32   (   0.03,-136.82) (   0.20,-136.06)   86.12                80
 01/20/2023   10:30:54   (  -0.04,-136.78) (  -0.02,-136.80)    3.39                80
 01/22/2023   22:34:05   (   0.04,-136.69) (  -0.13,-137.58)  100.59                80
 01/23/2023   22:17:59   (   0.04,-136.67) (   0.87,-133.05)  412.98                80