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The horizontal angle between the true meridian and magnetic meridian at a place is called
- a)azimuth
- b)declination
- c)local attraction
- d)magnetic bearing
Correct answer is option 'B'. Can you explain this answer?
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The horizontal angle between the true meridian and magnetic meridian a...
The Concept of Declination
The horizontal angle between the true meridian (geographic north) and the magnetic meridian (magnetic north) at any location is known as declination. This angle varies from place to place and changes over time due to shifts in the Earth's magnetic field.
Understanding the Terms
- **True Meridian**: This is the direction along the earth's surface towards the geographic North Pole.
- **Magnetic Meridian**: This direction points towards the magnetic North Pole, which is not fixed and changes due to the movement of molten iron within the Earth's outer core.
Why is Declination Important?
- **Navigational Accuracy**: Knowing the declination helps in accurately converting between true and magnetic bearings, crucial for navigation and surveying.
- **Engineering Applications**: Civil engineers often use declination to ensure proper orientation of structures, as misalignment can lead to significant errors in construction.
Other Related Terms
- **Azimuth**: This is the angle between a reference direction (often true north) and the line to a point, measured in the horizontal plane.
- **Local Attraction**: This phenomenon occurs when nearby magnetic materials affect the local magnetic field, causing deviations in magnetic readings.
- **Magnetic Bearing**: This refers to the direction to an object relative to magnetic north.
Conclusion
Understanding declination is essential for accurate measurements in civil engineering and navigation. It ensures that engineers and surveyors can effectively translate magnetic bearings into true bearings, leading to precision in their work.
The horizontal angle between the true meridian (geographic north) and the magnetic meridian (magnetic north) at any location is known as declination. This angle varies from place to place and changes over time due to shifts in the Earth's magnetic field.
Understanding the Terms
- **True Meridian**: This is the direction along the earth's surface towards the geographic North Pole.
- **Magnetic Meridian**: This direction points towards the magnetic North Pole, which is not fixed and changes due to the movement of molten iron within the Earth's outer core.
Why is Declination Important?
- **Navigational Accuracy**: Knowing the declination helps in accurately converting between true and magnetic bearings, crucial for navigation and surveying.
- **Engineering Applications**: Civil engineers often use declination to ensure proper orientation of structures, as misalignment can lead to significant errors in construction.
Other Related Terms
- **Azimuth**: This is the angle between a reference direction (often true north) and the line to a point, measured in the horizontal plane.
- **Local Attraction**: This phenomenon occurs when nearby magnetic materials affect the local magnetic field, causing deviations in magnetic readings.
- **Magnetic Bearing**: This refers to the direction to an object relative to magnetic north.
Conclusion
Understanding declination is essential for accurate measurements in civil engineering and navigation. It ensures that engineers and surveyors can effectively translate magnetic bearings into true bearings, leading to precision in their work.
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The horizontal angle between the true meridian and magnetic meridian at a place is calleda)azimuthb)declinationc)local attractiond)magnetic bearingCorrect answer is option 'B'. Can you explain this answer?
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