Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/19/2021   10:05:59   (   0.38,-127.95) (   0.94,-130.37)  276.11                80
 09/20/2021   09:49:54   (   0.38,-127.92) (  -0.06,-125.83)  237.34                80
 09/21/2021   22:09:12   (  -0.37,-127.83) (  -1.11,-131.14)  377.24                80
 09/22/2021   21:53:07   (  -0.38,-127.80) (  -0.10,-126.61)  135.97                80
 09/24/2021   10:12:16   (   0.36,-127.80) (   1.27,-131.88)  465.51                80
 09/25/2021   09:56:11   (   0.37,-127.76) (   0.27,-127.35)   47.49                80
 09/27/2021   21:56:43   (  -0.35,-127.63) (  -0.49,-128.11)   55.41                80
 09/28/2021   21:40:38   (  -0.36,-127.59) (   0.52,-123.58)  456.92                80
 09/30/2021   09:59:48   (   0.34,-127.57) (   0.60,-128.86)  146.40                80
 10/01/2021   09:43:42   (   0.34,-127.53) (  -0.35,-124.31)  365.76                80