Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/12/2021   10:07:20   (  -0.01,-128.09) (   0.50,-130.27)  248.10                80
 04/13/2021   09:45:55   (  -0.02,-128.07) (  -0.55,-125.74)  265.15                80
 04/14/2021   22:07:50   (   0.00,-128.03) (  -0.67,-131.04)  342.68                80
 04/15/2021   21:51:45   (   0.01,-128.00) (   0.32,-126.50)  170.97                80
 04/17/2021   10:13:32   (   0.00,-127.96) (   0.83,-131.77)  433.79                80
 04/18/2021   09:52:07   (  -0.01,-127.92) (  -0.16,-127.23)   78.66                80
 04/20/2021   21:55:18   (  -0.00,-127.83) (  -0.01,-128.00)   18.98                80
 04/21/2021   21:39:12   (   0.00,-127.79) (   0.98,-123.46)  494.12                80
 04/23/2021   10:00:58   (   0.01,-127.74) (   0.23,-128.72)  111.20                80
 04/24/2021   09:39:33   (  -0.00,-127.70) (  -0.76,-124.18)  400.64                80