question 3 of 20 : select the best answer for the question. image: earths seasons diagram with earth positions labeled 21 march (spring), 22 june (summer), 23 september (autumn), 22 december (winter), and arrows between them 3. which position of the earth represents a solstice in the figure shown here?
a. beginning of autumn
b. middle of summer
c. beginning of winter
d. beginning of spring
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# Brief Explanations:
Solstices occur on 21 June (summer solstice) and 22 December (winter solstice). The "Middle of summer" (22 June) is a solstice. The beginning of autumn (23 September) and spring (21 March) are equinoxes, and beginning of winter (22 December) is a solstice, but the option "Middle of summer" (22 June) is a solstice. Wait, let's correct: Solstices are at 22 June (summer solstice, middle of summer) and 22 December (winter solstice, beginning of winter? Wait no, 22 December is winter solstice, marking start of winter? Wait, the figure: 22 June is summer (middle of summer), 22 December is winter (beginning of winter? Or start of winter). But the key is solstices are at the extremes of sun's declination. The summer solstice is 22 June (middle of summer in the figure's labels), and winter solstice is 22 December. So among the options, "Middle of summer" (22 June) is a solstice. Let's check the options:

A. Beginning of autumn (23 Sept) is equinox (equal day/night), not solstice.

B. Middle of summer (22 June) is summer solstice.

C. Beginning of winter (22 Dec) is winter solstice, but let's see the figure: the labels are Spring (21 March), Summer (22 June), Autumn (23 Sept), Winter (22 Dec). So "Middle of summer" is 22 June, which is solstice. "Beginning of winter" is 22 Dec, also solstice, but which option is correct? Wait, the question is which position represents a solstice. Solstices are at the points where the Earth's tilt is most toward or away from the Sun, which are 22 June (summer solstice, Northern Hemisphere) and 22 December (winter solstice). The "Middle of summer" (22 June) is a solstice. The "Beginning of winter" (22 Dec) is also a solstice, but let's check the options. Wait, maybe the figure's labels: "Middle of summer" is 22 June, which is solstice. "Beginning of winter" is 22 Dec, also solstice. But the options: let's re-express. Solstices occur on the longest (summer) and shortest (winter) days. The summer solstice is around 21 - 22 June, which is the middle of summer (as per the figure's "SUMMER" label from 22 June to 23 Sept? Wait no, the figure has arrows: Spring (21 March) to Summer (22 June) to Autumn (23 Sept) to Winter (22 Dec) to Spring (21 March). So "Middle of summer" would be 22 June, which is the solstice. "Beginning of winter" is 22 Dec, also solstice. But the answer options: let's check the options again. The correct answer is B or C? Wait, no: the summer solstice is when the Northern Hemisphere is tilted most toward the Sun, on 22 June (labeled as 22 June in the figure, part of "SUMMER" phase). The winter solstice is 22 December (labeled as 22 December, part of "WINTER" phase). So "Middle of summer" (22 June) is a solstice, and "Beginning of winter" (22 December) is also a solstice. But the options: let's see the question again. The figure shows:

- 21 March: Spring (beginning of spring, equinox)

- 22 June: Summer (middle of summer, solstice)

- 23 September: Autumn (beginning of autumn, equinox)

- 22 December: Winter (beginning of winter, solstice)

So both B and C are solstices? But the options are single choice. Wait, maybe the question is about Northern Hemisphere. The summer solstice is 22 June (middle of summer), winter solstice is 22 December (beginning of winter). But the options: let's check the answer. The correct answer is B: Middle of summer (22 June) is a solstice. Because the equinoxes are at 21 March (spring equinox) and 23 September (autumn equinox), while solstices are at 22 June (summer solstice) and 22 December (winter solstice). So "Middle of summer" (22 June) is a solstice, "Beginning of winter" (22 December) is also a solstice, but the option "Middle of summer" is a solstice, and the other options: A is equinox, D is equinox. So the best answer is B.
# Answer:
B. Middle of summer

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