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)
 05/16/2021   22:07:57   (  -0.06,-128.14) (  -0.68,-131.04)  329.58                80
 05/17/2021   21:51:52   (  -0.06,-128.17) (   0.29,-126.50)  189.28                80
 05/19/2021   10:13:42   (   0.07,-128.27) (   0.85,-131.78)  400.63                80
 05/20/2021   09:52:18   (   0.07,-128.28) (  -0.18,-127.26)  117.45                80
 05/21/2021   22:14:15   (  -0.07,-128.24) (  -1.02,-132.56)  491.72                80
 05/22/2021   21:58:11   (  -0.07,-128.26) (  -0.04,-128.03)   26.68                80
 05/25/2021   10:01:17   (   0.07,-128.38) (   0.15,-128.78)   46.14                80
 05/26/2021   09:39:53   (   0.06,-128.39) (  -0.89,-124.26)  470.95                80
 05/27/2021   22:01:50   (  -0.06,-128.33) (  -0.36,-129.55)  140.10                80
 05/28/2021   21:45:46   (  -0.07,-128.34) (   0.68,-125.03)  377.22                80