Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 6.  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) (   0.69,-130.27)  238.71                80
 01/07/2021   09:46:07   (   0.18,-128.16) (  -0.38,-125.75)  275.93                80
 01/08/2021   22:10:42   (  -0.23,-128.19) (  -0.88,-131.04)  325.23                80
 01/09/2021   21:49:19   (  -0.21,-128.17) (   0.19,-126.52)  188.92                80
 01/11/2021   10:13:45   (   0.25,-128.10) (   1.08,-131.77)  418.15                80
 01/12/2021   09:52:21   (   0.23,-128.09) (   0.06,-127.24)   95.73                80
 01/14/2021   21:55:33   (  -0.25,-128.08) (  -0.24,-128.02)    7.51                80
 01/17/2021   10:01:15   (   0.28,-127.99) (   0.43,-128.75)   86.25                80
 01/18/2021   09:39:51   (   0.25,-127.97) (  -0.59,-124.22)  427.48                80
 01/19/2021   22:04:26   (  -0.29,-127.99) (  -0.66,-129.51)  174.63                80