Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 1 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 01/12/2023   22:24:20   (  -0.00,-137.31) (   0.60,-134.56)  312.89                80
 01/14/2023   10:46:07   (   0.00,-137.29) (   0.58,-139.83)  289.53                80
 01/15/2023   10:24:43   (   0.00,-137.28) (  -0.46,-135.31)  225.55                80
 01/16/2023   22:46:38   (  -0.00,-137.26) (  -0.75,-140.61)  381.49                80
 01/17/2023   22:30:33   (  -0.00,-137.24) (   0.24,-136.07)  133.01                80
 01/19/2023   10:52:20   (   0.00,-137.21) (   0.92,-141.35)  471.13                80
 01/20/2023   10:30:55   (   0.01,-137.19) (  -0.07,-136.81)   42.73                80
 01/22/2023   22:34:04   (  -0.01,-137.12) (  -0.13,-137.58)   52.35                80
 01/23/2023   22:17:59   (  -0.01,-137.10) (   0.87,-133.05)  461.32                80
 01/25/2023   10:39:46   (   0.01,-137.06) (   0.28,-138.32)  143.59                80
 01/26/2023   10:18:21   (   0.01,-137.03) (  -0.72,-133.79)  369.87                80