Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 12.  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   09:59:14   (  -0.05,-127.93) (   0.13,-128.89)  108.55                80
 07/13/2021   09:43:10   (  -0.04,-127.90) (  -0.85,-124.35)  403.95                80
 07/14/2021   22:02:27   (   0.06,-127.76) (  -0.34,-129.66)  216.02                80
 07/15/2021   21:46:22   (   0.05,-127.72) (   0.64,-125.12)  296.39                80
 07/17/2021   10:05:32   (  -0.07,-127.74) (   0.52,-130.40)  302.69                80
 07/18/2021   09:49:27   (  -0.06,-127.70) (  -0.46,-125.86)  209.15                80
 07/19/2021   22:08:45   (   0.09,-127.55) (  -0.73,-131.17)  412.41                80
 07/20/2021   21:52:40   (   0.08,-127.51) (   0.25,-126.63)   99.00                80
 07/23/2021   09:53:05   (  -0.09,-127.47) (  -0.08,-127.38)   10.19                80
 07/25/2021   21:56:18   (   0.10,-127.26) (  -0.12,-128.15)  101.63                80