Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/06/2021   10:07:31   (   0.21,-128.18) (   0.65,-130.28)  238.69                80
 01/07/2021   09:46:07   (   0.18,-128.16) (  -0.37,-125.75)  275.90                80
 01/08/2021   22:10:43   (  -0.23,-128.19) (  -0.84,-131.05)  325.49                80
 01/09/2021   21:49:19   (  -0.21,-128.17) (   0.18,-126.52)  188.62                80
 01/11/2021   10:13:45   (   0.25,-128.10) (   1.09,-131.77)  418.33                80
 01/12/2021   09:52:21   (   0.23,-128.08) (   0.07,-127.24)   95.56                80
 01/14/2021   21:55:54   (  -0.25,-128.08) (  -0.25,-128.01)    7.20                58
 01/17/2021   10:01:15   (   0.28,-127.99) (   0.45,-128.75)   86.65                80
 01/18/2021   09:39:51   (   0.25,-127.97) (  -0.57,-124.22)  427.02                80