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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/09/2021   09:56:06   (   0.42,-128.22) (   0.23,-127.35)   98.53                80
 09/11/2021   21:59:19   (  -0.42,-128.13) (  -0.41,-128.13)    0.97                80
 09/14/2021   09:59:43   (   0.41,-128.14) (   0.58,-128.86)   82.52                80
 09/15/2021   09:43:38   (   0.41,-128.12) (  -0.42,-124.33)  431.79                80
 09/16/2021   22:02:55   (  -0.39,-128.04) (  -0.75,-129.64)  182.30                80
 09/17/2021   21:46:51   (  -0.39,-128.02) (   0.25,-125.10)  331.84                80
 09/19/2021   10:05:59   (   0.38,-128.04) (   0.93,-130.37)  266.84                80
 09/20/2021   09:49:55   (   0.38,-128.02) (  -0.07,-125.84)  247.60                80
 09/21/2021   22:09:12   (  -0.37,-127.94) (  -1.09,-131.15)  366.09                80
 09/22/2021   21:53:08   (  -0.38,-127.92) (  -0.08,-126.62)  148.08                80