Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/23/2021   09:55:47   (  -0.11,-127.66) (  -0.19,-127.40)   30.24                80
 07/25/2021   21:56:20   (   0.12,-127.63) (  -0.02,-128.17)   61.67                80
 07/26/2021   21:40:16   (   0.10,-127.66) (   1.02,-123.64)  458.71                80
 07/28/2021   09:59:25   (  -0.12,-127.83) (   0.13,-128.92)  124.04                80
 07/29/2021   09:43:22   (  -0.11,-127.87) (  -0.91,-124.40)  396.20                80
 07/30/2021   22:02:39   (   0.14,-127.80) (  -0.28,-129.70)  216.15                80
 07/31/2021   21:46:35   (   0.13,-127.84) (   0.71,-125.17)  303.80                80
 08/02/2021   10:05:45   (  -0.15,-128.00) (   0.38,-130.46)  279.82                80
 08/03/2021   09:49:41   (  -0.14,-128.03) (  -0.60,-125.92)  239.71                80
 08/04/2021   22:08:58   (   0.17,-127.95) (  -0.59,-131.23)  373.83                80