Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 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)
 12/22/2021   21:47:17   (   0.02,-127.91) (   0.64,-125.19)  310.03                80
 12/24/2021   10:06:23   (  -0.04,-127.96) (   0.51,-130.46)  284.43                80
 12/25/2021   09:50:16   (  -0.03,-127.99) (  -0.47,-125.92)  235.64                80
 12/26/2021   22:09:32   (   0.05,-128.02) (  -0.67,-131.22)  365.28                80
 12/27/2021   21:53:26   (   0.04,-128.04) (   0.37,-126.69)  154.65                80
 12/29/2021   10:12:31   (  -0.05,-128.09) (   0.83,-131.95)  440.43                80
 12/30/2021   09:56:26   (  -0.04,-128.11) (  -0.21,-127.42)   78.95                80
 01/01/2022   21:56:54   (   0.04,-128.14) (   0.00,-128.18)    5.41                80
 01/04/2022   09:59:54   (  -0.04,-128.19) (   0.15,-128.91)   82.24                80