Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2020   10:36:37   (  -0.01,-137.22) (   0.23,-138.26)  118.01                80
 12/15/2020   10:20:32   (  -0.00,-137.22) (  -0.78,-133.73)  397.83                80
 12/16/2020   22:39:50   (   0.00,-137.21) (  -0.39,-139.04)  208.24                80
 12/17/2020   22:23:45   (  -0.00,-137.20) (   0.62,-134.51)  307.36                80
 12/19/2020   10:42:52   (  -0.00,-137.19) (   0.60,-139.77)  294.50                80
 12/20/2020   10:26:48   (   0.00,-137.19) (  -0.40,-135.24)  220.96                80
 12/21/2020   22:46:05   (   0.00,-137.17) (  -0.76,-140.56)  385.60                80
 12/22/2020   22:30:01   (   0.00,-137.16) (   0.25,-136.02)  129.69                80
 12/24/2020   10:49:09   (  -0.00,-137.15) (   0.91,-141.30)  472.66                80
 12/25/2020   10:33:05   (   0.00,-137.14) (  -0.09,-136.77)   42.28                80