Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/09/2021   10:01:03   (   0.06,-127.99) (   0.23,-128.72)   84.24                80
 05/10/2021   09:39:39   (   0.05,-128.02) (  -0.80,-124.20)  434.97                80
 05/11/2021   22:01:37   (  -0.05,-128.01) (  -0.41,-129.50)  170.24                80
 05/12/2021   21:45:33   (  -0.05,-128.05) (   0.62,-124.98)  349.30                80
 05/14/2021   10:07:23   (   0.05,-128.15) (   0.53,-130.26)  240.62                80
 05/15/2021   09:45:59   (   0.05,-128.17) (  -0.50,-125.73)  277.85                80
 05/16/2021   22:07:56   (  -0.05,-128.15) (  -0.71,-131.04)  329.52                80
 05/17/2021   21:51:53   (  -0.05,-128.17) (   0.32,-126.51)  189.30                80
 05/19/2021   10:13:42   (   0.06,-128.27) (   0.83,-131.79)  400.61                80
 05/20/2021   09:52:19   (   0.06,-128.29) (  -0.20,-127.27)  117.42                80
 05/21/2021   22:14:16   (  -0.06,-128.25) (  -1.00,-132.57)  491.69                80