Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/15/2021   09:45:59   (   0.06,-128.17) (  -0.49,-125.73)  277.84                80
 05/16/2021   22:07:56   (  -0.06,-128.14) (  -0.72,-131.03)  329.67                80
 05/17/2021   21:51:53   (  -0.06,-128.17) (   0.32,-126.51)  189.13                80
 05/19/2021   10:13:42   (   0.07,-128.26) (   0.83,-131.79)  400.84                80
 05/20/2021   09:52:18   (   0.07,-128.28) (  -0.15,-127.25)  117.18                80
 05/21/2021   22:14:15   (  -0.07,-128.24) (  -1.06,-132.55)  492.02                80
 05/22/2021   21:58:11   (  -0.07,-128.26) (  -0.02,-128.03)   26.22                80
 05/25/2021   10:01:17   (   0.07,-128.37) (   0.13,-128.79)   46.70                80
 05/26/2021   09:39:53   (   0.06,-128.38) (  -0.85,-124.25)  470.43                80
 05/27/2021   22:01:50   (  -0.06,-128.32) (  -0.34,-129.56)  140.64                80
 05/28/2021   21:45:47   (  -0.06,-128.33) (   0.70,-125.03)  376.62                80