Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/17/2021   21:51:52   (  -0.06,-128.17) (   0.28,-126.50)  189.39                80
 05/19/2021   10:13:41   (   0.07,-128.27) (   0.87,-131.78)  400.53                80
 05/20/2021   09:52:18   (   0.07,-128.29) (  -0.17,-127.26)  117.56                80
 05/21/2021   22:14:15   (  -0.07,-128.25) (  -1.04,-132.56)  491.52                80
 05/22/2021   21:58:12   (  -0.07,-128.27) (   0.00,-128.04)   26.90                80
 05/25/2021   10:01:17   (   0.07,-128.38) (   0.17,-128.78)   45.86                80
 05/26/2021   09:39:53   (   0.06,-128.39) (  -0.87,-124.26)  471.26                80
 05/27/2021   22:01:50   (  -0.07,-128.33) (  -0.32,-129.56)  139.73                80
 05/28/2021   21:45:46   (  -0.07,-128.34) (   0.66,-125.03)  377.62                80
 05/30/2021   10:07:35   (   0.07,-128.43) (   0.49,-130.30)  213.46                80