Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 10 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 10/20/2023   08:30:53   (   0.00,-104.70) (   0.41,-106.49)  204.89                80
 10/21/2023   08:09:30   (   0.00,-104.69) (  -0.62,-101.97)  309.91                80
 10/22/2023   20:31:30   (   0.00,-104.66) (  -0.58,-107.29)  299.95                80
 10/23/2023   20:15:26   (   0.00,-104.65) (   0.40,-102.76)  215.23                80
 10/25/2023   08:37:17   (  -0.00,-104.68) (   0.73,-108.05)  383.94                80
 10/26/2023   08:15:54   (  -0.00,-104.67) (  -0.24,-103.52)  131.28                80
 10/27/2023   20:37:53   (  -0.00,-104.64) (  -0.94,-108.84)  478.27                80
 10/28/2023   20:21:51   (  -0.00,-104.64) (   0.09,-104.32)   37.33                80
 10/31/2023   08:24:58   (   0.02,-104.66) (   0.11,-105.07)   45.88                80
 11/01/2023   08:03:34   (   0.02,-104.66) (  -0.87,-100.54)  469.32                80
 11/02/2023   20:25:33   (  -0.03,-104.62) (  -0.30,-105.86)  140.43                80