Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/11/2021   10:13:46   (   0.25,-128.10) (   1.05,-131.78)  418.39                80
 01/12/2021   09:52:21   (   0.23,-128.08) (   0.03,-127.25)   95.53                80
 01/14/2021   21:55:33   (  -0.25,-128.09) (  -0.22,-128.02)    8.16                80
 01/17/2021   10:01:15   (   0.28,-127.99) (   0.47,-128.74)   86.49                80
 01/18/2021   09:39:52   (   0.25,-127.97) (  -0.60,-124.23)  427.30                80
 01/19/2021   22:04:27   (  -0.29,-127.99) (  -0.65,-129.52)  174.23                80
 01/20/2021   21:43:02   (  -0.27,-127.97) (   0.37,-124.99)  339.28                80
 01/22/2021   10:07:30   (   0.32,-127.88) (   0.85,-130.25)  269.63                80
 01/23/2021   09:46:05   (   0.30,-127.86) (  -0.17,-125.72)  243.59                80