Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/03/2021   22:17:24   (   0.05,-137.20) (   0.97,-133.01)  476.64                80
 04/05/2021   10:39:11   (  -0.04,-137.15) (   0.19,-138.28)  128.48                80
 04/06/2021   10:17:45   (  -0.04,-137.13) (  -0.80,-133.74)  385.76                80
 04/07/2021   22:39:41   (   0.03,-137.11) (  -0.42,-139.04)  220.47                80
 04/08/2021   22:23:36   (   0.03,-137.08) (   0.63,-134.51)  293.74                80
 04/10/2021   10:45:23   (  -0.03,-137.03) (   0.59,-139.77)  311.63                80
 04/11/2021   10:23:57   (  -0.03,-137.01) (  -0.40,-135.23)  202.25                80
 04/12/2021   22:45:53   (   0.03,-136.98) (  -0.75,-140.54)  404.86                80
 04/13/2021   22:29:48   (   0.03,-136.95) (   0.24,-136.00)  108.70                80
 04/15/2021   10:51:34   (  -0.03,-136.89) (   0.97,-141.26)  497.70                80
 04/16/2021   10:30:10   (  -0.03,-136.86) (  -0.08,-136.73)   15.47                80