Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 4 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2019   21:58:27   (  -0.07,-128.10) (  -0.03,-128.06)    6.57                80
 05/04/2019   10:01:31   (   0.06,-128.16) (   0.18,-128.80)   72.92                80
 05/05/2019   09:40:07   (   0.07,-128.18) (  -0.81,-124.27)  445.64                80
 05/06/2019   22:02:04   (  -0.05,-128.22) (  -0.38,-129.58)  155.50                80
 05/07/2019   21:46:01   (  -0.06,-128.23) (   0.67,-125.05)  362.75                80
 05/09/2019   10:05:09   (   0.05,-128.25) (   0.53,-130.32)  236.40                80
 05/10/2019   09:49:06   (   0.06,-128.26) (  -0.52,-125.80)  281.26                80
 05/11/2019   22:08:23   (  -0.05,-128.28) (  -0.66,-131.11)  321.47                80
 05/12/2019   21:52:18   (  -0.06,-128.30) (   0.33,-126.57)  196.20                80