Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/02/2021   09:39:52   (   0.15,-128.21) (  -0.73,-124.24)  453.21                80
 01/03/2021   22:04:28   (  -0.19,-128.24) (  -0.48,-129.54)  148.17                80
 01/04/2021   21:43:04   (  -0.16,-128.23) (   0.53,-125.01)  366.40                80
 01/06/2021   10:07:31   (   0.21,-128.17) (   0.68,-130.27)  238.95                80
 01/07/2021   09:46:06   (   0.18,-128.16) (  -0.34,-125.74)  275.47                80
 01/08/2021   22:10:43   (  -0.23,-128.18) (  -0.87,-131.04)  326.64                80
 01/09/2021   21:49:18   (  -0.21,-128.16) (   0.14,-126.51)  187.31                80
 01/11/2021   10:13:46   (   0.25,-128.09) (   1.07,-131.78)  419.37                80
 01/12/2021   09:52:21   (   0.23,-128.07) (   0.05,-127.25)   94.30                80
 01/14/2021   21:55:33   (  -0.25,-128.06) (  -0.23,-128.02)    5.06                80