Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/16/2021   22:02:55   (  -0.39,-127.98) (  -0.76,-129.63)  188.88                80
 09/17/2021   21:46:51   (  -0.39,-127.95) (   0.24,-125.10)  324.43                80
 09/19/2021   10:05:59   (   0.38,-127.96) (   0.93,-130.37)  275.49                80
 09/20/2021   09:49:55   (   0.38,-127.93) (  -0.07,-125.84)  238.08                80
 09/21/2021   22:09:12   (  -0.37,-127.84) (  -1.10,-131.15)  376.91                80
 09/22/2021   21:53:07   (  -0.38,-127.81) (  -0.09,-126.61)  136.43                80
 09/24/2021   10:12:16   (   0.36,-127.81) (   1.27,-131.88)  464.27                80
 09/25/2021   09:56:11   (   0.37,-127.78) (   0.26,-127.35)   48.89                80
 09/27/2021   21:56:43   (  -0.35,-127.64) (  -0.47,-128.11)   54.21                80
 09/28/2021   21:40:39   (  -0.36,-127.60) (   0.53,-123.58)  458.20                80