Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 3 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/19/2021   21:58:13   (   0.10,-128.42) (   0.16,-128.10)   36.79                80
 03/22/2021   10:01:15   (  -0.09,-128.39) (   0.04,-128.82)   50.06                80
 03/23/2021   09:39:51   (  -0.09,-128.38) (  -1.01,-124.30)  465.37                80
 03/24/2021   22:01:46   (   0.08,-128.39) (  -0.21,-129.59)  137.72                80
 03/25/2021   21:45:41   (   0.08,-128.38) (   0.83,-125.07)  378.04                80
 03/27/2021   10:07:29   (  -0.07,-128.35) (   0.35,-130.33)  224.92                80
 03/28/2021   09:46:03   (  -0.08,-128.34) (  -0.64,-125.80)  289.89                80
 03/29/2021   22:07:59   (   0.07,-128.33) (  -0.58,-131.09)  315.12                80
 03/30/2021   21:51:54   (   0.07,-128.32) (   0.47,-126.56)  200.01                80
 04/01/2021   10:13:41   (  -0.06,-128.29) (   0.70,-131.83)  402.96                80