Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2020   22:16:58   (  -0.17,-128.27) (  -1.10,-132.56)  487.81                80
 12/29/2020   21:55:33   (  -0.15,-128.27) (  -0.09,-128.03)   27.24                80
 01/01/2021   10:01:16   (   0.17,-128.22) (   0.29,-128.76)   61.84                80
 01/02/2021   09:39:52   (   0.15,-128.21) (  -0.72,-124.23)  452.84                80
 01/03/2021   22:04:28   (  -0.19,-128.22) (  -0.49,-129.53)  149.59                80
 01/04/2021   21:43:04   (  -0.16,-128.21) (   0.58,-125.02)  364.76                80
 01/06/2021   10:07:31   (   0.21,-128.16) (   0.69,-130.27)  240.26                80
 01/07/2021   09:46:07   (   0.18,-128.15) (  -0.38,-125.75)  273.97                80
 01/08/2021   22:10:43   (  -0.23,-128.15) (  -0.89,-131.04)  329.13                80
 01/09/2021   21:49:18   (  -0.21,-128.14) (   0.13,-126.51)  184.61                80