Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 1 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/17/2020   22:01:43   (   0.05,-128.43) (  -0.21,-129.54)  127.09                80
 01/18/2020   21:45:37   (   0.05,-128.43) (   0.80,-125.01)  389.79                80
 01/20/2020   10:04:44   (  -0.05,-128.43) (   0.39,-130.27)  209.81                80
 01/21/2020   09:48:38   (  -0.04,-128.43) (  -0.62,-125.73)  306.90                80
 01/22/2020   22:07:53   (   0.04,-128.42) (  -0.55,-131.04)  298.24                80
 01/23/2020   21:51:48   (   0.03,-128.42) (   0.47,-126.50)  218.09                80
 01/25/2020   10:10:54   (  -0.03,-128.41) (   0.72,-131.77)  382.46                80
 01/26/2020   09:54:49   (  -0.03,-128.41) (  -0.29,-127.23)  133.78                80
 01/27/2020   22:16:44   (   0.04,-128.39) (  -0.87,-132.54)  471.55                80
 01/28/2020   21:55:19   (   0.04,-128.39) (   0.15,-128.00)   44.53                80