Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 6 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)
 06/18/2019   21:58:52   (   0.05,-128.21) (   0.09,-128.15)    8.88                80
 06/21/2019   09:59:15   (  -0.06,-128.16) (   0.09,-128.88)   82.30                80
 06/22/2019   09:43:11   (  -0.05,-128.13) (  -0.92,-124.35)  431.56                80
 06/23/2019   22:02:27   (   0.07,-128.09) (  -0.30,-129.65)  178.01                80
 06/24/2019   21:46:23   (   0.06,-128.07) (   0.70,-125.12)  336.03                80
 06/26/2019   10:05:32   (  -0.08,-128.03) (   0.42,-130.40)  268.88                80
 06/27/2019   09:49:27   (  -0.07,-128.00) (  -0.53,-125.85)  244.51                80
 06/28/2019   22:08:44   (   0.10,-127.95) (  -0.63,-131.16)  366.82                80
 06/29/2019   21:52:40   (   0.09,-127.92) (   0.38,-126.63)  146.40                80