Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/24/2021   10:12:16   (   0.36,-127.79) (   1.26,-131.88)  466.29                80
 09/25/2021   09:56:11   (   0.37,-127.75) (   0.25,-127.35)   46.64                80
 09/27/2021   21:56:43   (  -0.35,-127.62) (  -0.47,-128.11)   55.74                80
 09/28/2021   21:40:39   (  -0.36,-127.58) (   0.54,-123.58)  456.40                80
 09/30/2021   09:59:47   (   0.34,-127.55) (   0.63,-128.85)  147.98                80
 10/01/2021   09:43:43   (   0.34,-127.51) (  -0.37,-124.32)  363.99                80
 10/02/2021   22:02:59   (  -0.32,-127.41) (  -0.84,-129.61)  251.77                80
 10/03/2021   21:46:54   (  -0.33,-127.37) (   0.17,-125.08)  259.92                80
 10/05/2021   10:06:03   (   0.30,-127.33) (   1.00,-130.35)  345.51                80
 10/06/2021   09:49:58   (   0.31,-127.28) (  -0.01,-125.82)  166.17                80