Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 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)
 12/29/2021   10:12:31   (  -0.05,-128.10) (   0.83,-131.95)  439.53                80
 12/30/2021   09:56:26   (  -0.04,-128.12) (  -0.21,-127.42)   80.13                80
 01/01/2022   21:59:35   (   0.04,-128.17) (   0.05,-128.19)    2.77                80
 01/04/2022   09:59:55   (  -0.04,-128.22) (   0.09,-128.92)   79.54                80
 01/05/2022   09:43:48   (  -0.03,-128.23) (  -0.89,-124.38)  439.34                80
 01/06/2022   22:03:02   (   0.05,-128.26) (  -0.30,-129.67)  162.35                80
 01/07/2022   21:46:57   (   0.04,-128.27) (   0.75,-125.15)  356.63                80
 01/09/2022   10:06:02   (  -0.05,-128.30) (   0.44,-130.41)  240.16                80
 01/10/2022   09:49:57   (  -0.05,-128.32) (  -0.61,-125.88)  278.65                80