Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 1 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)
 01/21/2015   10:31:24   (  -0.09,-134.53) (   0.08,-135.18)   75.65                80
 01/22/2015   10:12:38   (  -0.09,-134.47) (  -0.94,-130.65)  435.68                80
 01/23/2015   22:34:31   (   0.09,-134.36) (  -0.24,-135.95)  181.25                80
 01/24/2015   22:18:24   (   0.09,-134.30) (   0.73,-131.41)  330.00                80
 01/26/2015   10:40:08   (  -0.09,-134.26) (   0.45,-136.67)  274.74                80
 01/27/2015   10:18:40   (  -0.09,-134.20) (  -0.53,-132.12)  236.05                80
 01/28/2015   22:40:34   (   0.09,-134.07) (  -0.66,-137.42)  382.12                80
 01/29/2015   22:24:26   (   0.08,-134.01) (   0.32,-132.88)  128.57                80
 01/31/2015   10:46:10   (  -0.08,-133.96) (   0.85,-138.14)  476.55                80
 02/01/2015   10:24:43   (  -0.08,-133.90) (  -0.12,-133.60)   33.78                80
 02/03/2015   22:27:49   (   0.07,-133.69) (  -0.08,-134.35)   75.31                80