Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/19/2021   22:04:27   (  -0.30,-127.97) (  -0.65,-129.52)  176.53                80
 01/20/2021   21:43:02   (  -0.27,-127.94) (   0.37,-124.99)  336.58                80
 01/22/2021   10:07:30   (   0.32,-127.85) (   0.83,-130.25)  272.83                80
 01/23/2021   09:46:05   (   0.30,-127.82) (  -0.19,-125.72)  239.99                80
 01/24/2021   22:10:41   (  -0.34,-127.83) (  -1.06,-131.01)  363.25                80
 01/25/2021   21:49:16   (  -0.32,-127.79) (  -0.04,-126.48)  149.15                80
 01/27/2021   10:13:43   (   0.36,-127.69) (   1.25,-131.75)  461.61                80
 01/28/2021   09:52:19   (   0.34,-127.66) (   0.23,-127.22)   50.46                80
 01/30/2021   21:58:10   (  -0.37,-127.61) (  -0.44,-127.98)   42.12                80
 01/31/2021   21:36:45   (  -0.34,-127.57) (   0.59,-123.45)  469.60                80