Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/12/2021   21:45:34   (  -0.05,-128.04) (   0.64,-124.98)  349.25                80
 05/14/2021   10:07:23   (   0.06,-128.14) (   0.51,-130.26)  240.74                80
 05/15/2021   09:45:58   (   0.05,-128.17) (  -0.47,-125.72)  277.73                80
 05/16/2021   22:07:57   (  -0.06,-128.14) (  -0.69,-131.04)  329.85                80
 05/17/2021   21:51:52   (  -0.06,-128.16) (   0.29,-126.50)  188.94                80
 05/19/2021   10:13:42   (   0.07,-128.26) (   0.86,-131.78)  401.08                80
 05/20/2021   09:52:18   (   0.07,-128.28) (  -0.17,-127.26)  116.88                80
 05/21/2021   22:14:15   (  -0.07,-128.24) (  -1.03,-132.56)  492.35                80
 05/22/2021   21:58:12   (  -0.07,-128.26) (   0.01,-128.04)   25.96                80
 05/25/2021   10:01:17   (   0.06,-128.37) (   0.17,-128.78)   47.13                80
 05/26/2021   09:39:53   (   0.06,-128.38) (  -0.86,-124.26)  469.88                80