Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2018   10:40:02   (   0.35,-135.51) (   0.91,-138.14)  298.65                80
 09/21/2018   10:18:37   (   0.35,-135.53) (  -0.08,-133.60)  219.38                80
 09/22/2018   22:40:35   (  -0.34,-135.52) (  -1.07,-138.91)  386.37                80
 09/23/2018   22:24:30   (  -0.34,-135.54) (  -0.08,-134.38)  132.09                80
 09/25/2018   10:46:19   (   0.32,-135.60) (   1.22,-139.66)  462.08                80
 09/26/2018   10:24:55   (   0.34,-135.61) (   0.22,-135.12)   55.47                80
 09/28/2018   22:28:08   (  -0.33,-135.59) (  -0.38,-135.90)   34.84                80
 09/29/2018   22:12:03   (  -0.33,-135.60) (   0.62,-131.37)  482.63                80
 10/01/2018   10:33:53   (   0.31,-135.65) (   0.52,-136.65)  113.15                80
 10/02/2018   10:12:28   (   0.32,-135.65) (  -0.48,-132.11)  403.08                80