Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2021   22:03:22   (   0.03,-127.87) (  -0.38,-129.72)  210.42                80
 12/22/2021   21:47:16   (   0.02,-127.90) (   0.60,-125.18)  309.92                80
 12/24/2021   10:06:22   (  -0.04,-127.96) (   0.55,-130.45)  284.46                80
 12/25/2021   09:50:17   (  -0.03,-127.99) (  -0.49,-125.92)  235.59                80
 12/26/2021   22:09:32   (   0.05,-128.02) (  -0.65,-131.23)  365.50                80
 12/27/2021   21:53:25   (   0.04,-128.04) (   0.33,-126.69)  154.38                80
 12/29/2021   10:12:32   (  -0.05,-128.09) (   0.81,-131.96)  440.56                80
 12/30/2021   09:56:25   (  -0.04,-128.11) (  -0.17,-127.42)   78.81                80
 01/01/2022   21:56:54   (   0.04,-128.14) (   0.02,-128.18)    4.82                80