Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 4 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/15/2019   21:55:34   (  -0.06,-127.62) (  -0.16,-127.99)   42.46                80
 04/16/2019   21:39:30   (  -0.06,-127.58) (   0.88,-123.47)  469.51                80
 04/18/2019   09:58:39   (   0.06,-127.54) (   0.32,-128.73)  136.37                80
 04/19/2019   09:42:34   (   0.06,-127.50) (  -0.66,-124.20)  375.47                80
 04/20/2019   22:01:51   (  -0.06,-127.42) (  -0.54,-129.50)  237.97                80
 04/21/2019   21:45:47   (  -0.06,-127.38) (   0.45,-124.97)  273.56                80
 04/23/2019   10:04:56   (   0.06,-127.32) (   0.69,-130.25)  333.34                80
 04/24/2019   09:48:52   (   0.06,-127.28) (  -0.29,-125.72)  178.00                80
 04/25/2019   22:08:09   (  -0.06,-127.19) (  -0.90,-131.02)  436.04                80
 04/26/2019   21:52:05   (  -0.06,-127.15) (   0.08,-126.49)   75.06                80