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co-altitude

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co-altitude

[kō′al·tə‚tüd]
(astronomy)
zenith distance
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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References in periodicals archive
I asked Flight Lead if he had the guy 45 right at 6 nm, co-altitude. I do not remember any reply from Lead.
Forward quarter night VID: it can be done if you are willing to die for it!
* We attempted a co-altitude, night-section rendezvous (without NVDs)--the closest I ever came to dying.
The 2 stupidest things
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.
The bright lights of Vegas
Reach also was co-altitude, which wasn't surprising.
In harm's way
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!"
Near-midairs with a train. (ORM Corner)
Had we been co-altitude, we probably would have collided.
What ship's radar blind spot?
He passed us co-altitude, about 200 feet from our aircraft.
Is that a shortcut to the target? (ORM Corner)
We met, making hard left turns at co-altitude within several hundred feet of each other.
Why the C-9 Told the P-3, "Fights On!"
The lights were getting bigger and brighter and were co-altitude as I reached 600 feet.
Right to Right, in the Pattern
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