Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/30/2021   09:56:26   (  -0.04,-128.12) (  -0.19,-127.42)   80.13                80
 01/01/2022   21:56:54   (   0.04,-128.17) (   0.04,-128.18)    1.20                80
 01/04/2022   09:59:54   (  -0.04,-128.22) (   0.11,-128.91)   79.10                80
 01/05/2022   09:43:48   (  -0.03,-128.24) (  -0.87,-124.37)  439.83                80
 01/06/2022   22:03:03   (   0.05,-128.26) (  -0.26,-129.68)  161.50                80
 01/07/2022   21:46:57   (   0.04,-128.28) (   0.73,-125.14)  357.52                80
 01/09/2022   10:06:03   (  -0.05,-128.31) (   0.41,-130.41)  239.38                80
 01/10/2022   09:49:56   (  -0.04,-128.33) (  -0.58,-125.87)  279.49                80
 01/11/2022   22:09:11   (   0.05,-128.35) (  -0.60,-131.17)  322.17                80