Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 9 16.  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)
 09/16/2023   20:09:16   (  -0.00,-104.69) (   0.79,-101.25)  392.07                80
 09/18/2023   08:31:03   (   0.00,-104.71) (   0.42,-106.52)  206.11                80
 09/19/2023   08:09:38   (   0.00,-104.71) (  -0.59,-101.99)  309.90                80
 09/20/2023   20:31:35   (  -0.00,-104.68) (  -0.61,-107.29)  298.01                80
 09/21/2023   20:15:30   (  -0.00,-104.68) (   0.41,-102.76)  218.00                80
 09/23/2023   08:37:18   (   0.00,-104.70) (   0.73,-108.04)  380.49                80
 09/24/2023   08:15:53   (   0.00,-104.69) (  -0.24,-103.50)  135.14                80
 09/25/2023   20:37:49   (  -0.01,-104.65) (  -0.96,-108.80)  473.51                80
 09/26/2023   20:21:45   (  -0.01,-104.65) (   0.07,-104.28)   42.51                80
 09/29/2023   08:24:48   (   0.01,-104.67) (   0.09,-105.02)   39.09                80
 09/30/2023   08:03:23   (   0.01,-104.67) (  -0.94,-100.49)  476.91                80