Understanding Coordinate Systems

What is the significance of the prime meridian in measuring geographical coordinates?

• It divides the Earth into northern and southern hemispheres.

• It is used to measure east and west from Greenwich.

• It marks the highest point in the sky.

• It is the starting point for measuring altitude.

In the horizontal coordinate system, what does the term 'Zenith' refer to?

• The angle between an object and the prime meridian.

• The point directly overhead at 90° altitude.

• The starting point for measuring right ascension.

• The angle between an object and the equator.

How is azimuth measured in the horizontal coordinate system?

• Anticlockwise from the first point of Aries.

• From the equator to the object.

• Clockwise from north to the object.

• From the prime meridian to the object.

What is declination in the equatorial coordinate system?

• The angle between an object and the first point of Aries.

• The angle between an object and the horizon.

• The angle between an object and the celestial equator.

• The angle between an object and the prime meridian.

Why is the first point of Aries important in the equatorial coordinate system?

• It marks the highest point in the sky.

• It is the starting point for measuring right ascension.

• It is used to measure altitude.

• It divides the Earth into hemispheres.