Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/14/2021   10:07:23   (   0.06,-128.14) (   0.52,-130.26)  240.68                80
 05/15/2021   09:45:59   (   0.06,-128.17) (  -0.51,-125.73)  277.79                80
 05/16/2021   22:07:57   (  -0.06,-128.14) (  -0.70,-131.04)  329.77                80
 05/17/2021   21:51:53   (  -0.06,-128.17) (   0.34,-126.51)  189.03                80
 05/19/2021   10:13:41   (   0.07,-128.26) (   0.87,-131.78)  400.97                80
 05/20/2021   09:52:18   (   0.07,-128.28) (  -0.16,-127.25)  117.01                80
 05/21/2021   22:14:15   (  -0.07,-128.24) (  -1.04,-132.56)  492.21                80
 05/22/2021   21:58:12   (  -0.07,-128.26) (  -0.01,-128.04)   26.03                80
 05/25/2021   10:01:17   (   0.06,-128.37) (   0.18,-128.78)   46.97                80
 05/26/2021   09:39:53   (   0.06,-128.38) (  -0.85,-124.25)  470.11                80
 05/27/2021   22:01:50   (  -0.06,-128.32) (  -0.34,-129.56)  141.02                80