Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/17/2021   10:13:31   (   0.01,-127.95) (   0.88,-131.76)  433.63                80
 04/18/2021   09:52:07   (   0.00,-127.92) (  -0.17,-127.23)   78.82                80
 04/20/2021   21:55:17   (  -0.01,-127.82) (  -0.05,-127.99)   18.89                80
 04/21/2021   21:39:11   (  -0.00,-127.79) (   0.94,-123.45)  493.90                80
 04/23/2021   10:00:58   (   0.02,-127.74) (   0.26,-128.71)  111.26                80
 04/24/2021   09:39:33   (   0.01,-127.69) (  -0.79,-124.18)  400.58                80
 04/25/2021   22:01:28   (  -0.02,-127.62) (  -0.42,-129.48)  211.53                80
 04/26/2021   21:45:23   (  -0.01,-127.58) (   0.58,-124.94)  300.66                80
 04/28/2021   10:07:09   (   0.02,-127.53) (   0.63,-130.20)  304.40                80
 04/29/2021   09:45:45   (   0.01,-127.48) (  -0.42,-125.67)  206.60                80
 04/30/2021   22:07:39   (  -0.02,-127.38) (  -0.84,-130.96)  408.12                80