How Seasons Occur - Part 2
Continuing from Part 1, understanding solstices and equinoxes helps us further understand the changing lengths of day and night across seaso
Core concept
A solstice occurs when a hemisphere is tilted most towards or away from the sun, resulting in the longest or shortest day of the year.
How it works
The summer solstice (around June 21) has the longest day in the Northern Hemisphere, while winter solstice (around December 21) has the shortest.
Why it matters
An equinox occurs when neither hemisphere is tilted towards the sun, resulting in nearly equal day and night length worldwide.
Key detail
Understanding solstices and equinoxes helps us track seasonal changes and their impact on daylight hours throughout the year.
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Key diagram

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Quick notes
• Solstice: hemisphere tilted most towards/away from sun.
• Results in longest or shortest day.
• Summer solstice (~June 21): longest day (N. Hemisphere).
• Winter solstice (~Dec 21): shortest day.
• Equinox: neither hemisphere tilted towards sun.
• Nearly equal day and night worldwide.
• These mark seasonal transition points.
• They help track daylight hour changes.