Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 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)
 09/14/2021   09:59:43   (   0.41,-128.10) (   0.58,-128.86)   86.95                80
 09/15/2021   09:43:38   (   0.41,-128.07) (  -0.42,-124.33)  426.55                80
 09/16/2021   22:02:55   (  -0.39,-127.98) (  -0.75,-129.64)  188.83                80
 09/17/2021   21:46:51   (  -0.39,-127.95) (   0.25,-125.10)  324.52                80
 09/19/2021   10:05:59   (   0.38,-127.96) (   0.92,-130.37)  275.27                80
 09/20/2021   09:49:55   (   0.38,-127.93) (  -0.08,-125.84)  238.35                80
 09/21/2021   22:09:12   (  -0.37,-127.84) (  -1.08,-131.15)  376.61                80
 09/22/2021   21:53:08   (  -0.38,-127.81) (  -0.08,-126.62)  136.82                80
 09/24/2021   10:12:16   (   0.36,-127.81) (   1.25,-131.89)  463.82                80
 09/25/2021   09:56:12   (   0.37,-127.78) (   0.25,-127.35)   49.45                80