Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 6 18.  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   21:58:51   (   0.05,-128.21) (   0.04,-128.13)    9.06                80
 06/21/2019   09:59:16   (  -0.06,-128.15) (   0.08,-128.88)   82.72                80
 06/22/2019   09:43:11   (  -0.05,-128.13) (  -0.92,-124.35)  431.06                80
 06/23/2019   22:02:27   (   0.07,-128.09) (  -0.30,-129.65)  178.36                80
 06/24/2019   21:46:23   (   0.06,-128.06) (   0.71,-125.12)  335.59                80
 06/26/2019   10:05:32   (  -0.08,-128.03) (   0.42,-130.40)  269.76                80
 06/27/2019   09:49:27   (  -0.07,-128.00) (  -0.53,-125.85)  243.53                80
 06/28/2019   22:08:44   (   0.10,-127.94) (  -0.63,-131.16)  367.67                80
 06/29/2019   21:52:40   (   0.09,-127.91) (   0.38,-126.63)  145.45                80
 07/01/2019   10:11:48   (  -0.12,-127.87) (   0.80,-131.90)  460.53                80
 07/02/2019   09:55:43   (  -0.11,-127.83) (  -0.20,-127.37)   51.73                80