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Chapter 3: Problem 20

How is an annular eclipse of the Sun different from a total eclipse of the Sun? What causes this difference?

Short Answer

Expert verified
An annular eclipse differs from a total eclipse of the Sun in that during an annular eclipse, the Moon doesn't completely cover the Sun, creating a visible ring of sunlight around the Moon. This occurs because the Moon is farther away from the Earth in its orbit (at apogee), and thus appears smaller. In contrast, during a total eclipse, the moon completely covers the Sun as it is closer to Earth in its orbit (at perigee).

Step by step solution

01

Identify the different Eclipse Types

A total eclipse occurs when the Moon completely obscures the Sun, leaving only the solar corona visible from Earth. On the other hand, an annular eclipse occurs when the Moon is in front of the Sun but does not completely cover it, leading to a visible ring (annulus) of sunlight around the Moon.
02

Understand the Causes of the Eclipses

The difference in the visual sizes of the Sun and Moon as seen from Earth is the main cause for these different types of eclipses. This can be attributed to the Moon's elliptical orbit around the Earth.
03

Relate the Moon's Orbit to the Eclipse Type

When the Moon is closer to the Earth (perigee), it appears larger and can cover the Sun completely, resulting in a total eclipse. However, when the Moon is farther from the Earth (apogee), it appears smaller and cannot cover the Sun completely, resulting in an annular eclipse.

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Most popular questions from this chapter

In his 1885 novel King Solomon's Mines, H. Rider Haggard described a total solar eclipse that was seen in both South Africa and in the British Isles. Is such an eclipse possible? Why or why not?

Is the far side of the Moon (the side that can never be seen from Earth) the same as the dark side of the Moon? Explain.

(a) Suppose the diameter of the Moon were doubled, but the orbit of the Moon remained the same. Would total solar eclipses be more common, less common, or just as common as they are now? Explain. (b) Suppose the diameter of the Moon were halved, but the orbit of the Moon remained the same. Explain why there would be no total solar eclipses.

Describe the cycle of lunar phases that would be observed if the Moon moved around the Earth in an orbit perpendicular to the plane of the Earth's orbit. Would it be possible for both solar and lunar eclipses to occur under these circumstances? Explain your reasoning.

The Moon is highest in the sky when it crosses the meridian (see Figure 2-21), halfway between the time of moonrise and the time of moonset. What is the phase of the Moon if it is highest in the sky at (a) midnight; (b) sunrise; (c) noon; (d) sunset? Explain your answers.
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