Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 1 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/10/2020   22:36:13   (  -0.03,-137.20) (  -0.13,-137.51)   36.15                80
 01/11/2020   22:17:27   (  -0.03,-137.19) (   0.88,-132.97)  479.79                80
 01/13/2020   10:39:15   (   0.04,-137.17) (   0.25,-138.25)  121.88                80
 01/14/2020   10:17:49   (   0.03,-137.16) (  -0.76,-133.71)  393.51                80
 01/15/2020   22:42:24   (  -0.04,-137.14) (  -0.47,-139.00)  212.43                80
 01/16/2020   22:20:58   (  -0.04,-137.13) (   0.54,-134.47)  302.85                80
 01/18/2020   10:45:24   (   0.05,-137.11) (   0.66,-139.73)  299.41                80
 01/19/2020   10:23:59   (   0.04,-137.09) (  -0.35,-135.20)  215.40                80
 01/20/2020   22:45:54   (  -0.05,-137.06) (  -0.81,-140.50)  391.72                80
 01/21/2020   22:27:09   (  -0.05,-137.04) (   0.20,-135.97)  122.83                80
 01/23/2020   10:51:35   (   0.06,-137.01) (   0.99,-141.23)  480.33                80
 01/24/2020   10:30:10   (   0.06,-136.99) (  -0.02,-136.69)   33.79                80