Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 6 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/22/2019   09:43:11   (  -0.05,-128.12) (  -0.89,-124.34)  430.78                80
 06/23/2019   22:02:28   (   0.07,-128.09) (  -0.27,-129.65)  178.20                80
 06/24/2019   21:46:23   (   0.06,-128.06) (   0.74,-125.12)  335.67                80
 06/26/2019   10:05:32   (  -0.08,-128.02) (   0.44,-130.39)  270.28                80
 06/27/2019   09:49:27   (  -0.07,-127.99) (  -0.56,-125.86)  242.91                80
 06/28/2019   22:08:45   (   0.10,-127.94) (  -0.59,-131.17)  367.88                80
 06/29/2019   21:52:39   (   0.09,-127.90) (   0.35,-126.63)  145.22                80
 07/01/2019   10:11:48   (  -0.12,-127.86) (   0.77,-131.91)  461.40                80
 07/02/2019   09:55:43   (  -0.11,-127.82) (  -0.18,-127.36)   50.89                80
 07/04/2019   21:56:16   (   0.12,-127.70) (   0.04,-128.14)   49.94                80