Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/24/2021   09:56:10   (  -0.26,-128.31) (  -0.43,-127.49)   92.73                80
 08/26/2021   21:56:43   (   0.26,-128.24) (   0.24,-128.26)    4.13                80
 08/29/2021   09:59:47   (  -0.27,-128.33) (  -0.11,-129.01)   78.28                80
 08/30/2021   09:43:44   (  -0.27,-128.33) (  -1.16,-124.49)  438.25                80
 08/31/2021   22:03:00   (   0.29,-128.25) (  -0.08,-129.78)  175.82                80
 09/01/2021   21:46:57   (   0.29,-128.24) (   0.97,-125.26)  340.08                80
 09/03/2021   10:06:05   (  -0.30,-128.31) (   0.21,-130.53)  253.35                80
 09/04/2021   09:50:01   (  -0.30,-128.31) (  -0.79,-126.00)  262.48                80
 09/05/2021   22:11:58   (   0.31,-128.22) (  -0.39,-131.31)  351.84                80