Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/17/2017   22:39:54   (   0.18,-135.21) (  -0.66,-138.91)  421.58                80
 07/18/2017   22:23:50   (   0.18,-135.18) (   0.38,-134.38)   92.50                80
 07/21/2017   10:26:51   (  -0.19,-135.07) (  -0.20,-135.11)    4.18                80
 07/23/2017   22:27:22   (   0.21,-135.02) (   0.00,-135.87)   97.12                80
 07/24/2017   22:11:18   (   0.20,-134.99) (   1.05,-131.34)  416.23                80
 07/26/2017   10:30:24   (  -0.22,-134.90) (   0.18,-136.60)  194.00                80
 07/27/2017   10:14:20   (  -0.21,-134.86) (  -0.86,-132.07)  318.91                80
 07/28/2017   22:33:35   (   0.23,-134.84) (  -0.36,-137.36)  288.35                80
 07/29/2017   22:17:30   (   0.22,-134.80) (   0.68,-132.84)  224.67                80