Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/13/2021   22:21:43   (  -0.03,-137.16) (   0.55,-134.62)  290.73                80
 07/15/2021   10:46:12   (   0.04,-137.16) (   0.66,-139.88)  310.76                80
 07/16/2021   10:24:48   (   0.03,-137.15) (  -0.38,-135.36)  204.47                80
 07/17/2021   22:49:25   (  -0.03,-137.13) (  -0.81,-140.66)  402.38                80
 07/18/2021   22:28:01   (  -0.03,-137.12) (   0.17,-136.13)  112.26                80
 07/20/2021   10:52:30   (   0.02,-137.09) (   0.98,-141.40)  491.07                80
 07/21/2021   10:31:07   (   0.01,-137.08) (  -0.06,-136.88)   23.03                80
 07/23/2021   22:34:20   (   0.02,-137.02) (  -0.14,-137.65)   72.41                80
 07/24/2021   22:18:16   (   0.02,-137.00) (   0.91,-133.13)  441.41                80
 07/26/2021   10:37:24   (  -0.02,-136.97) (   0.30,-138.39)  162.65                80