Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/03/2021   22:04:28   (  -0.19,-128.24) (  -0.46,-129.54)  148.00                80
 01/04/2021   21:43:04   (  -0.16,-128.23) (   0.55,-125.01)  366.64                80
 01/06/2021   10:07:31   (   0.21,-128.17) (   0.65,-130.27)  238.80                80
 01/07/2021   09:46:07   (   0.18,-128.16) (  -0.36,-125.74)  275.68                80
 01/08/2021   22:10:43   (  -0.23,-128.18) (  -0.85,-131.05)  326.17                80
 01/09/2021   21:49:19   (  -0.21,-128.16) (   0.17,-126.52)  187.83                80
 01/11/2021   10:13:45   (   0.25,-128.10) (   1.10,-131.77)  418.93                80
 01/12/2021   09:52:21   (   0.23,-128.08) (   0.03,-127.25)   94.83                80
 01/14/2021   21:58:12   (  -0.26,-128.07) (  -0.27,-128.01)    6.28                80