Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 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)
 01/13/2021   22:17:34   (   0.02,-137.22) (   0.93,-133.03)  476.97                80
 01/15/2021   10:39:23   (  -0.02,-137.22) (   0.22,-138.31)  124.28                80
 01/16/2021   10:17:58   (  -0.02,-137.22) (  -0.80,-133.78)  392.03                80
 01/17/2021   22:39:55   (   0.02,-137.22) (  -0.40,-139.08)  212.05                80
 01/18/2021   22:23:50   (   0.02,-137.22) (   0.62,-134.56)  304.17                80
 01/20/2021   10:45:38   (  -0.02,-137.21) (   0.54,-139.83)  297.58                80
 01/21/2021   10:24:13   (  -0.02,-137.21) (  -0.42,-135.29)  218.23                80
 01/22/2021   22:46:10   (   0.03,-137.20) (  -0.71,-140.61)  387.06                80
 01/23/2021   22:30:05   (   0.03,-137.20) (   0.25,-136.06)  128.30                80
 01/25/2021   10:51:53   (  -0.03,-137.17) (   0.90,-141.34)  474.95                80
 01/26/2021   10:30:29   (  -0.04,-137.16) (  -0.11,-136.81)   39.78                80