Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2020   22:10:42   (  -0.03,-128.09) (  -0.68,-131.04)  336.17                80
 12/08/2020   21:49:16   (  -0.00,-128.11) (   0.33,-126.50)  181.96                80
 12/10/2020   10:13:43   (   0.04,-128.12) (   0.85,-131.77)  415.45                80
 12/11/2020   09:52:17   (   0.02,-128.14) (  -0.16,-127.24)  102.64                80
 12/12/2020   22:16:53   (  -0.06,-128.17) (  -1.02,-132.54)  496.71                80
 12/13/2020   21:55:27   (  -0.04,-128.18) (   0.00,-128.00)   20.71                80
 12/16/2020   10:01:07   (   0.07,-128.20) (   0.22,-128.72)   60.89                80
 12/17/2020   09:39:42   (   0.04,-128.21) (  -0.86,-124.20)  456.43                80
 12/18/2020   22:04:17   (  -0.08,-128.23) (  -0.37,-129.49)  143.64                80
 12/19/2020   21:42:51   (  -0.06,-128.24) (   0.65,-124.96)  373.35                80