The summer solstice occurs around which date when the North Pole is most directly tilted toward the Sun?

The summer solstice occurs around which date when the North Pole is most directly tilted toward the Sun?

• A. Around June 21
• B. Around December 22
• C. Around March 21 and September 23
• D. Around June 21 when the axis is perpendicular to the Sun

Answer: (A)

The key idea is that the solstices are defined by how the tilt of Earth’s axis points toward or away from the Sun, which changes how high the Sun climbs in the sky and how long the day lasts. At the summer solstice, the Northern Hemisphere is tilted most toward the Sun, so the Sun reaches its highest point at noon and daylight is longest. This happens around June 21 each year, with slight date variations possible. The other dates correspond to different points in the year: around December 22 is when the Northern Hemisphere is tilted away from the Sun, giving the shortest day; around March 21 and September 23 are the equinoxes when day and night are roughly equal in length. The idea that the axis is perpendicular to the Sun isn’t how this is defined—the solstice depends on the tilt toward the Sun, not a perpendicular orientation.

The key idea is that the solstices are defined by how the tilt of Earth’s axis points toward or away from the Sun, which changes how high the Sun climbs in the sky and how long the day lasts. At the summer solstice, the Northern Hemisphere is tilted most toward the Sun, so the Sun reaches its highest point at noon and daylight is longest. This happens around June 21 each year, with slight date variations possible.

The other dates correspond to different points in the year: around December 22 is when the Northern Hemisphere is tilted away from the Sun, giving the shortest day; around March 21 and September 23 are the equinoxes when day and night are roughly equal in length. The idea that the axis is perpendicular to the Sun isn’t how this is defined—the solstice depends on the tilt toward the Sun, not a perpendicular orientation.