co-altitude


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co-altitude

[kō′al·tə‚tüd]
(astronomy)

zenith distance (ZD)

zenith distance (ZD)click for a larger image
The angular distance through the arc of a vertical circle between the zenith and a point on the celestial sphere, measured from the zenith through 90°, for bodies above the horizon. Also known as co-altitude.
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References in periodicals archive ?
You and all of your co-altitude traffic will still be flying at a pressure altitude of 30,000 feet.
I asked Flight Lead if he had the guy 45 right at 6 nm, co-altitude.
Reach also was co-altitude, which wasn't surprising.
It was co-altitude with us at about a mile and a hale The pilot slammed the throttles forward and pulled back on the yoke, as I yelled, "Climb, climb, climb
Flying at 27,500 feet, the top of their block of 27,000 to 28,000 feet, the B-1 lead immediately stepped down 500 feet, putting the two aircraft co-altitude with ours.
Had we been co-altitude, we probably would have collided.