Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 3 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/25/2021   21:45:42   (   0.08,-128.39) (   0.84,-125.07)  379.19                80
 03/27/2021   10:07:28   (  -0.06,-128.36) (   0.39,-130.32)  223.74                80
 03/28/2021   09:46:03   (  -0.07,-128.35) (  -0.65,-125.80)  291.23                80
 03/29/2021   22:07:59   (   0.06,-128.35) (  -0.57,-131.09)  313.16                80
 03/30/2021   21:51:54   (   0.07,-128.34) (   0.48,-126.56)  202.17                80
 04/01/2021   10:13:41   (  -0.05,-128.31) (   0.75,-131.82)  400.73                80
 04/02/2021   09:52:16   (  -0.06,-128.29) (  -0.29,-127.29)  113.43                80
 04/03/2021   22:14:11   (   0.05,-128.26) (  -0.92,-132.59)  493.36                80
 04/04/2021   21:58:06   (   0.05,-128.24) (   0.07,-128.05)   21.46                80
 04/07/2021   10:01:08   (  -0.04,-128.19) (   0.11,-128.78)   67.36                80