Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/12/2021   09:59:13   (  -0.05,-127.93) (   0.19,-128.88)  108.63                80
 07/13/2021   09:43:10   (  -0.04,-127.89) (  -0.85,-124.35)  403.82                80
 07/14/2021   22:02:27   (   0.06,-127.76) (  -0.34,-129.66)  216.20                80
 07/15/2021   21:46:23   (   0.05,-127.72) (   0.64,-125.12)  296.17                80
 07/17/2021   10:05:32   (  -0.07,-127.74) (   0.52,-130.40)  303.02                80
 07/18/2021   09:49:27   (  -0.06,-127.70) (  -0.46,-125.86)  208.76                80
 07/19/2021   22:08:45   (   0.08,-127.55) (  -0.73,-131.17)  412.84                80
 07/20/2021   21:52:40   (   0.08,-127.50) (   0.25,-126.63)   98.53                80
 07/23/2021   09:55:46   (  -0.09,-127.46) (  -0.13,-127.39)    9.22                80