Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/14/2021   22:07:50   (   0.00,-128.03) (  -0.70,-131.03)  342.78                80
 04/15/2021   21:51:45   (   0.01,-128.00) (   0.35,-126.50)  170.80                80
 04/17/2021   10:13:32   (   0.00,-127.95) (   0.86,-131.76)  433.85                80
 04/18/2021   09:52:06   (  -0.00,-127.92) (  -0.13,-127.22)   78.61                80
 04/20/2021   21:55:17   (  -0.00,-127.82) (  -0.03,-127.99)   19.11                80
 04/21/2021   21:39:12   (   0.00,-127.79) (   0.97,-123.45)  493.72                80
 04/23/2021   10:00:58   (   0.01,-127.74) (   0.24,-128.71)  111.49                80
 04/24/2021   09:39:32   (   0.00,-127.69) (  -0.75,-124.17)  400.32                80
 04/25/2021   22:01:28   (  -0.01,-127.62) (  -0.45,-129.47)  211.73                80
 04/26/2021   21:45:23   (  -0.01,-127.58) (   0.60,-124.95)  300.49                80