Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2021   21:53:07   (  -0.38,-127.80) (  -0.13,-126.60)  136.21                80
 09/24/2021   10:12:15   (   0.36,-127.79) (   1.30,-131.87)  466.17                80
 09/25/2021   09:56:11   (   0.37,-127.75) (   0.29,-127.34)   46.76                80
 09/27/2021   21:56:44   (  -0.35,-127.62) (  -0.45,-128.12)   55.74                80
 09/28/2021   21:40:39   (  -0.36,-127.58) (   0.56,-123.58)  456.46                80
 09/30/2021   09:59:47   (   0.34,-127.56) (   0.61,-128.85)  147.67                80
 10/01/2021   09:43:43   (   0.34,-127.51) (  -0.39,-124.32)  364.34                80
 10/02/2021   22:02:59   (  -0.32,-127.41) (  -0.82,-129.62)  251.56                80
 10/03/2021   21:46:55   (  -0.33,-127.37) (   0.19,-125.09)  260.15                80
 10/05/2021   10:06:03   (   0.30,-127.33) (   0.98,-130.36)  345.03                80