Understanding Supermoons and Angular Size

What causes the apparent size of the moon to change during a supermoon?

• The sun's position affects the moon.

• The Earth's orbit changes.

• The moon's distance from Earth changes.

• The moon's actual size increases.

What does the term 'angular size' refer to in astronomy?

• The actual size of an object.

• The brightness of an object.

• The size an object appears to be from Earth.

• The distance of an object from Earth.

How does the angular size of an object change as it moves farther away?

• It fluctuates randomly.

• It remains the same.

• It decreases.

• It increases.

What is the small-angle approximation used for?

• Calculating the actual size of distant objects.

• Estimating the distance to nearby stars.

• Simplifying the calculation of angular size for small angles.

• Measuring the brightness of celestial bodies.

In the small-angle formula, what does the constant 206,265 represent?

• The average distance from Earth to the moon.

• The number of radians in a circle.

• The conversion factor for arc-seconds.

• The number of degrees in a circle.

Why are arc-seconds preferred over degrees in astronomy?

• They provide more precision for small angles.

• They are easier to calculate.

• They are used for measuring time.

• They are a standard unit in physics.

What is the approximate angular size of the supermoon at perigee?

• 1991 arc-seconds

• 1770 arc-seconds

• 206,265 arc-seconds

• 360,000 arc-seconds

How much larger does the supermoon appear compared to the micromoon?

• 5% larger

• 15% larger

• 10% larger

• 12% larger

What is the distance of the moon from Earth during a micromoon?

• 360,000 kilometers

• 405,000 kilometers

• 450,000 kilometers

• 500,000 kilometers

What is the diameter of the moon used in the calculations?

• 3,475 kilometers

• 3,600 kilometers

• 3,800 kilometers

• 4,000 kilometers