Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/29/2021   21:46:11   (  -0.01,-128.21) (   0.68,-125.10)  354.75                80
 07/01/2021   10:05:20   (  -0.00,-128.26) (   0.49,-130.37)  241.17                80
 07/02/2021   09:49:17   (   0.00,-128.24) (  -0.55,-125.85)  272.78                80
 07/03/2021   22:08:34   (   0.01,-128.12) (  -0.64,-131.16)  345.20                80
 07/04/2021   21:52:30   (   0.01,-128.10) (   0.33,-126.62)  168.67                80
 07/06/2021   10:11:39   (  -0.03,-128.15) (   0.83,-131.89)  427.69                80
 07/07/2021   09:55:35   (  -0.02,-128.12) (  -0.20,-127.37)   85.52                80
 07/09/2021   21:56:08   (   0.03,-127.95) (  -0.01,-128.14)   21.11                80
 07/10/2021   21:40:04   (   0.02,-127.92) (   0.97,-123.60)  491.85                80
 07/12/2021   09:59:13   (  -0.04,-127.96) (   0.19,-128.88)  105.62                80