Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

A、Greenwich celestial meridian

B、hour circle of the body

C、local celestial meridian

D、vertical circle of the body

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更多“Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.”相关的问题

第1题

[单选题] A time diagram is a diagram on the plane of the（）.

A、celestial meridian B、celestial equator C、celestial horizon D、principal vertical circle

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第2题

[单选题] A time diagram is a diagram of the celestial sphere as observed from above the（）.

A、south celestial pole B、north celestial pole C、observer's meridian D、Greenwich meridian

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第3题

[单选题] The equator is（）.

A、the primary great circle of the Earth perpendicular to the axis B、the line to which all celestial observations are reduced C、the line from which a celestial body's altitude is measured D、All of the above

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第4题

[单选题] The “urgent” priority should be used for messages（）.

A、concerning the Safety of Life at Sea (SOLAS) B、detailing important navigational warnings C、containing information concerning the safety of a mobile unit or person D、concerning on-scene communications

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第5题

[单选题] The most accurate method of determining gyrocompass error while underway is by（）.

A、Comparing the gyro azimuth of a celestial body with the computed azimuth of the body B、Comparing the gyro heading with the magnetic compass heading C、Determining from the chart the course made good between celestial fixes D、It cannot be determined accurately at sea due to drift of unknown currents