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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/06/2021   21:55:18   (  -0.06,-127.85) (  -0.06,-127.98)   15.18                80
 05/09/2021   10:01:03   (   0.05,-127.99) (   0.23,-128.72)   84.09                80
 05/10/2021   09:39:39   (   0.05,-128.02) (  -0.80,-124.20)  435.21                80
 05/11/2021   22:01:38   (  -0.05,-128.02) (  -0.36,-129.51)  169.86                80
 05/12/2021   21:45:33   (  -0.04,-128.05) (   0.62,-124.98)  349.80                80
 05/14/2021   10:07:23   (   0.05,-128.15) (   0.53,-130.26)  239.95                80
 05/15/2021   09:45:59   (   0.04,-128.18) (  -0.50,-125.73)  278.61                80
 05/16/2021   22:07:56   (  -0.05,-128.16) (  -0.71,-131.04)  328.63                80
 05/17/2021   21:51:53   (  -0.05,-128.18) (   0.33,-126.51)  190.31                80
 05/19/2021   10:13:42   (   0.05,-128.28) (   0.83,-131.79)  399.40                80