Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 3 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)
 03/13/2023   20:17:00   (  -0.01,-104.75) (   0.40,-102.85)  216.07                80
 03/15/2023   08:38:46   (   0.02,-104.74) (   0.80,-108.12)  385.23                80
 03/16/2023   08:17:21   (   0.02,-104.74) (  -0.21,-103.59)  131.45                80
 03/17/2023   20:39:16   (  -0.02,-104.76) (  -0.96,-108.89)  471.35                80
 03/18/2023   20:23:11   (  -0.02,-104.76) (   0.06,-104.36)   45.67                80
 03/21/2023   08:26:11   (   0.02,-104.76) (   0.10,-105.09)   37.89                80
 03/22/2023   08:04:46   (   0.01,-104.77) (  -0.93,-100.56)  479.28                80
 03/23/2023   20:26:40   (  -0.02,-104.79) (  -0.28,-105.86)  122.65                80
 03/24/2023   20:10:35   (  -0.02,-104.80) (   0.76,-101.33)  394.97                80
 03/26/2023   08:32:21   (   0.02,-104.80) (   0.40,-106.60)  204.86                80