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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/15/2021   21:46:22   (   0.05,-127.73) (   0.61,-125.12)  296.84                80
 07/17/2021   10:05:31   (  -0.07,-127.75) (   0.54,-130.39)  301.92                80
 07/18/2021   09:49:28   (  -0.07,-127.71) (  -0.50,-125.87)  210.07                80
 07/19/2021   22:08:45   (   0.09,-127.56) (  -0.70,-131.18)  411.38                80
 07/20/2021   21:52:41   (   0.08,-127.52) (   0.28,-126.64)  100.17                80
 07/22/2021   10:11:50   (  -0.10,-127.53) (   0.87,-131.92)  499.80                80
 07/23/2021   09:55:46   (  -0.10,-127.48) (  -0.11,-127.38)   11.45                80
 07/25/2021   21:56:18   (   0.11,-127.28) (  -0.10,-128.15)   99.73                80
 07/26/2021   21:40:14   (   0.10,-127.23) (   0.88,-123.61)  411.65                80
 07/28/2021   09:59:23   (  -0.12,-127.24) (   0.28,-128.89)  188.38                80