Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/06/2021   22:46:08   (   0.02,-137.22) (  -0.74,-140.58)  383.43                80
 01/07/2021   22:30:04   (   0.02,-137.22) (   0.28,-136.05)  133.13                80
 01/09/2021   10:49:11   (   0.01,-137.22) (   0.93,-141.32)  467.41                80
 01/10/2021   10:30:27   (   0.01,-137.21) (  -0.08,-136.79)   48.62                80
 01/12/2021   22:33:39   (  -0.01,-137.20) (  -0.10,-137.56)   41.46                80
 01/13/2021   22:17:34   (  -0.01,-137.19) (   0.92,-133.03)  474.00                80
 01/15/2021   10:39:22   (   0.01,-137.18) (   0.24,-138.31)  128.25                80
 01/16/2021   10:17:57   (   0.01,-137.17) (  -0.72,-133.77)  387.11                80
 01/17/2021   22:39:54   (  -0.01,-137.16) (  -0.41,-139.08)  219.00                80
 01/18/2021   22:23:49   (  -0.01,-137.15) (   0.55,-134.54)  296.25                80