Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 13.  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)
 12/13/2023   08:16:39   (   0.00,-104.69) (  -0.20,-103.69)  113.15                80
 12/14/2023   20:38:37   (   0.00,-104.66) (  -0.95,-109.00)  494.40                80
 12/15/2023   20:22:32   (   0.01,-104.66) (   0.06,-104.47)   21.88                80
 12/18/2023   08:25:36   (  -0.01,-104.68) (   0.10,-105.21)   59.76                80
 12/19/2023   08:04:11   (  -0.01,-104.68) (  -0.91,-100.68)  456.62                80
 12/20/2023   20:26:08   (   0.01,-104.66) (  -0.28,-105.98)  150.35                80
 12/21/2023   20:10:03   (   0.01,-104.66) (   0.74,-101.45)  366.29                80
 12/23/2023   08:31:52   (  -0.01,-104.69) (   0.43,-106.72)  231.12                80
 12/24/2023   08:10:27   (  -0.02,-104.69) (  -0.59,-102.19)  285.19                80
 12/25/2023   20:32:23   (   0.03,-104.66) (  -0.59,-107.50)  322.35                80
 12/26/2023   20:16:19   (   0.03,-104.67) (   0.43,-102.97)  194.14                80