Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/07/2021   09:46:07   (   0.18,-128.16) (  -0.36,-125.74)  275.87                80
 01/08/2021   22:10:43   (  -0.23,-128.19) (  -0.85,-131.05)  325.09                80
 01/09/2021   21:49:19   (  -0.21,-128.17) (   0.17,-126.52)  189.05                80
 01/11/2021   10:13:45   (   0.25,-128.10) (   1.10,-131.77)  418.13                80
 01/12/2021   09:52:21   (   0.23,-128.09) (   0.03,-127.25)   95.81                80
 01/14/2021   21:58:12   (  -0.26,-128.09) (  -0.27,-128.01)    8.42                80
 01/17/2021   10:01:15   (   0.28,-127.99) (   0.46,-128.74)   86.10                80
 01/18/2021   09:39:52   (   0.25,-127.98) (  -0.62,-124.23)  427.67                80
 01/19/2021   22:04:27   (  -0.29,-127.99) (  -0.64,-129.52)  174.22                80
 01/20/2021   21:43:02   (  -0.27,-127.97) (   0.39,-124.99)  339.31                80