Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/04/2021   10:45:36   (   0.00,-137.21) (   0.57,-139.81)  295.57                80
 01/05/2021   10:24:12   (   0.00,-137.22) (  -0.44,-135.28)  221.71                80
 01/06/2021   22:46:08   (  -0.00,-137.23) (  -0.77,-140.58)  381.46                80
 01/07/2021   22:30:03   (   0.00,-137.24) (   0.25,-136.05)  135.47                80
 01/09/2021   10:51:52   (  -0.01,-137.24) (   0.90,-141.32)  465.04                80
 01/10/2021   10:30:27   (  -0.01,-137.24) (  -0.11,-136.79)   51.19                80
 01/12/2021   22:33:39   (   0.02,-137.24) (  -0.07,-137.57)   37.76                80
 01/13/2021   22:17:35   (   0.02,-137.24) (   0.94,-133.04)  478.27                80
 01/15/2021   10:39:23   (  -0.03,-137.23) (   0.21,-138.32)  123.26                80
 01/16/2021   10:17:58   (  -0.03,-137.23) (  -0.81,-133.79)  392.58                80
 01/17/2021   22:39:55   (   0.03,-137.22) (  -0.38,-139.09)  212.69                80