Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 7.  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) (   0.20,-128.73)   84.22                80
 05/10/2021   09:39:40   (   0.05,-128.02) (  -0.83,-124.21)  435.07                80
 05/11/2021   22:01:37   (  -0.05,-128.02) (  -0.38,-129.51)  170.07                80
 05/12/2021   21:45:34   (  -0.05,-128.05) (   0.65,-124.99)  349.50                80
 05/14/2021   10:07:23   (   0.05,-128.15) (   0.50,-130.26)  240.35                80
 05/15/2021   09:46:00   (   0.04,-128.17) (  -0.53,-125.74)  278.19                80
 05/16/2021   22:07:57   (  -0.05,-128.15) (  -0.68,-131.04)  329.15                80
 05/17/2021   21:51:52   (  -0.05,-128.18) (   0.30,-126.51)  189.74                80
 05/19/2021   10:13:42   (   0.06,-128.28) (   0.86,-131.78)  400.10                80
 05/20/2021   09:52:18   (   0.05,-128.30) (  -0.17,-127.26)  117.93                80