Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 1 10.  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)
 01/11/2023   22:40:25   (   0.00,-137.31) (  -0.42,-139.09)  202.76                80
 01/12/2023   22:24:20   (  -0.00,-137.31) (   0.61,-134.56)  312.87                80
 01/14/2023   10:46:08   (   0.00,-137.29) (   0.56,-139.84)  289.56                80
 01/15/2023   10:24:42   (   0.00,-137.28) (  -0.42,-135.30)  225.50                80
 01/16/2023   22:46:39   (  -0.00,-137.26) (  -0.73,-140.61)  381.54                80
 01/17/2023   22:30:33   (  -0.00,-137.24) (   0.25,-136.08)  132.94                80
 01/19/2023   10:52:20   (   0.00,-137.21) (   0.91,-141.35)  471.22                80
 01/20/2023   10:30:55   (   0.01,-137.19) (  -0.08,-136.82)   42.62                80
 01/22/2023   22:34:05   (  -0.01,-137.12) (  -0.13,-137.58)   52.47                80
 01/23/2023   22:17:59   (  -0.01,-137.10) (   0.87,-133.05)  461.15                80