Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/23/2021   22:30:05   (   0.02,-137.20) (   0.27,-136.07)  128.75                80
 01/25/2021   10:51:52   (   0.02,-137.18) (   0.94,-141.33)  472.81                80
 01/26/2021   10:30:28   (   0.02,-137.16) (  -0.08,-136.80)   41.88                80
 01/28/2021   22:33:39   (  -0.01,-137.12) (  -0.14,-137.56)   51.59                80
 01/29/2021   22:17:34   (  -0.01,-137.10) (   0.88,-133.04)  462.73                80
 01/31/2021   10:39:23   (   0.01,-137.07) (   0.27,-138.31)  141.29                80
 02/01/2021   10:17:58   (   0.01,-137.05) (  -0.75,-133.78)  372.55                80
 02/02/2021   22:39:53   (  -0.01,-137.01) (  -0.48,-139.08)  236.26                80
 02/03/2021   22:23:49   (  -0.00,-136.98) (   0.54,-134.55)  277.33                80
 02/05/2021   10:45:36   (   0.01,-136.94) (   0.67,-139.81)  327.68                80