Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/12/2018   10:14:30   (  -0.01,-134.42) (  -0.51,-132.10)  264.61                80
 06/13/2018   22:33:46   (   0.03,-134.38) (  -0.67,-137.40)  345.00                80
 06/14/2018   22:17:41   (   0.02,-134.32) (   0.36,-132.87)  165.83                80
 06/16/2018   10:36:49   (  -0.05,-134.20) (   0.84,-138.13)  448.59                80
 06/17/2018   10:20:43   (  -0.03,-134.14) (  -0.13,-133.59)   61.84                80
 06/19/2018   22:21:15   (   0.04,-134.02) (  -0.02,-134.37)   38.60                80
 06/20/2018   22:05:10   (   0.03,-133.96) (   0.95,-129.82)  471.82                80
 06/22/2018   10:24:17   (  -0.06,-133.84) (   0.24,-135.09)  143.06                80
 06/23/2018   10:08:13   (  -0.05,-133.77) (  -0.79,-130.56)  366.89                80
 06/24/2018   22:27:29   (   0.08,-133.71) (  -0.39,-135.86)  245.11                80