Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 11 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)
 11/21/2017   10:21:23   (   0.05,-135.11) (  -0.23,-133.76)  153.45                80
 11/22/2017   22:40:39   (  -0.03,-135.06) (  -0.95,-139.07)  457.64                80
 11/23/2017   22:24:35   (  -0.04,-135.08) (   0.09,-134.54)   61.95                80
 11/26/2017   10:24:58   (   0.03,-135.25) (   0.04,-135.29)    5.04                80
 11/28/2017   22:28:08   (  -0.02,-135.20) (  -0.23,-136.06)   98.24                80
 11/29/2017   22:12:04   (  -0.03,-135.22) (   0.81,-131.53)  420.56                80
 12/01/2017   10:31:11   (   0.01,-135.34) (   0.36,-136.80)  167.05                80
 12/02/2017   10:15:07   (   0.02,-135.36) (  -0.68,-132.28)  351.20                80
 12/03/2017   22:34:22   (  -0.00,-135.28) (  -0.54,-137.58)  262.50                80
 12/04/2017   22:18:18   (  -0.02,-135.29) (   0.51,-133.05)  255.18                80