Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/09/2021   10:51:52   (  -0.03,-137.23) (   0.89,-141.33)  466.45                80
 01/10/2021   10:30:28   (  -0.02,-137.25) (  -0.13,-136.80)   51.91                80
 01/12/2021   22:33:39   (  -0.01,-137.30) (  -0.06,-137.57)   30.85                80
 01/13/2021   22:17:35   (  -0.02,-137.31) (   0.95,-133.04)  487.21                80
 01/15/2021   10:39:22   (   0.02,-137.32) (   0.26,-138.30)  112.08                80
 01/16/2021   10:17:58   (   0.02,-137.34) (  -0.76,-133.77)  405.53                80
 01/17/2021   22:39:55   (   0.00,-137.36) (  -0.38,-139.09)  196.75                80
 01/18/2021   22:23:51   (   0.01,-137.37) (   0.64,-134.56)  320.63                80
 01/20/2021   10:45:39   (  -0.01,-137.38) (   0.52,-139.84)  279.19                80
 01/21/2021   10:24:13   (   0.00,-137.39) (  -0.44,-135.30)  238.36                80
 01/22/2021   22:46:10   (  -0.01,-137.41) (  -0.75,-140.60)  364.33                80