Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/10/2021   22:42:42   (  -0.01,-137.20) (  -0.42,-139.08)  214.05                80
 06/11/2021   22:21:18   (   0.00,-137.20) (   0.62,-134.56)  302.00                80
 06/13/2021   10:45:47   (   0.00,-137.20) (   0.59,-139.82)  298.83                80
 06/14/2021   10:24:23   (  -0.00,-137.19) (  -0.46,-135.30)  216.88                80
 06/15/2021   22:48:59   (  -0.00,-137.18) (  -0.78,-140.59)  388.98                80
 06/16/2021   22:27:36   (  -0.00,-137.18) (   0.26,-136.07)  126.49                80
 06/18/2021   10:52:04   (   0.00,-137.17) (   0.94,-141.34)  475.25                80
 06/19/2021   10:30:41   (   0.00,-137.16) (  -0.10,-136.81)   39.90                80
 06/21/2021   22:36:34   (   0.00,-137.12) (  -0.08,-137.59)   52.80                80
 06/22/2021   22:15:09   (   0.01,-137.10) (   0.91,-133.05)  461.50                80