false
False.
Zero.
zero = horizon
above the horizon is the answer
An object seen halfway between the horizon and the zenith has an altitude of 45 degrees.An object seen due east of the observer has an azimuth of 90 degrees.
False.
Almost . . ."Altitude" is the apparent angle of the object above the horizon.
Zero.
zero = horizon
66.5 degrees
above the horizon is the answer
The altitude of aircraft is measured above the ground, not above the horizon, and it's a distance. The altitude of the sun is not measured above the ground, and it's not a distance. If it were, it would always be some number near 93 million miles. The altitude of the sun is the angle that an observer sees between his horizon and the sun, and it's different for different observers in different places.
90 degrees
The star is at an altitude of 15 degrees above the horizon at midnight.
An object seen halfway between the horizon and the zenith has an altitude of 45 degrees.An object seen due east of the observer has an azimuth of 90 degrees.
it's 23 degrees below the horizon; you won't see it.
Polaris will be 23.5 degrees above the northern horizon when viewed from the Tropic of Cancer.