Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/12/2021   22:43:07   (  -0.03,-137.17) (  -0.48,-139.14)  224.89                80
 07/13/2021   22:21:43   (  -0.03,-137.16) (   0.56,-134.62)  290.66                80
 07/15/2021   10:46:12   (   0.04,-137.16) (   0.66,-139.88)  310.92                80
 07/16/2021   10:24:48   (   0.03,-137.15) (  -0.38,-135.36)  204.28                80
 07/17/2021   22:49:26   (  -0.03,-137.13) (  -0.81,-140.66)  402.59                80
 07/18/2021   22:28:01   (  -0.03,-137.11) (   0.17,-136.13)  112.01                80
 07/20/2021   10:52:30   (   0.02,-137.09) (   0.98,-141.40)  491.40                80
 07/21/2021   10:31:07   (   0.01,-137.07) (  -0.06,-136.88)   22.63                80
 07/23/2021   22:34:20   (   0.02,-137.02) (  -0.14,-137.65)   72.84                80
 07/24/2021   22:18:16   (   0.02,-136.99) (   0.90,-133.13)  440.95                80