Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/15/2021   10:07:48   (   0.04,-128.49) (   0.43,-130.35)  210.73                80
 06/16/2021   09:46:23   (   0.05,-128.48) (  -0.54,-125.81)  304.56                80
 06/17/2021   22:08:21   (  -0.04,-128.39) (  -0.66,-131.11)  310.56                80
 06/18/2021   21:52:17   (  -0.05,-128.38) (   0.37,-126.59)  204.78                80
 06/20/2021   10:11:26   (   0.04,-128.45) (   0.80,-131.86)  389.53                80
 06/21/2021   09:55:23   (   0.04,-128.43) (  -0.23,-127.34)  125.05                80
 06/22/2021   22:14:40   (  -0.03,-128.32) (  -0.97,-132.64)  492.11                80
 06/23/2021   21:58:36   (  -0.03,-128.30) (   0.00,-128.11)   22.22                80
 06/26/2021   09:59:02   (   0.02,-128.34) (   0.13,-128.86)   59.15                80
 06/27/2021   09:42:57   (   0.03,-128.32) (  -0.84,-124.32)  454.77                80