Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 3 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/18/2021   22:14:19   (   0.10,-128.42) (  -0.83,-132.63)  479.81                80
 03/19/2021   21:58:13   (   0.10,-128.42) (   0.15,-128.09)   36.84                80
 03/22/2021   10:01:16   (  -0.09,-128.39) (  -0.01,-128.84)   50.08                80
 03/23/2021   09:39:50   (  -0.10,-128.38) (  -0.99,-124.30)  465.32                80
 03/24/2021   22:01:47   (   0.08,-128.39) (  -0.17,-129.60)  137.74                80
 03/25/2021   21:45:41   (   0.08,-128.38) (   0.82,-125.06)  378.04                80
 03/27/2021   10:07:29   (  -0.07,-128.35) (   0.36,-130.33)  224.95                80
 03/28/2021   09:46:03   (  -0.08,-128.34) (  -0.63,-125.79)  289.86                80
 03/29/2021   22:07:59   (   0.07,-128.33) (  -0.53,-131.10)  315.11                80
 03/30/2021   21:51:54   (   0.07,-128.32) (   0.46,-126.56)  200.03                80