Here's why:
* Solstice: A solstice marks the point in the year when the sun reaches its highest or lowest point in the sky, leading to the longest or shortest day of the year.
* Declination: This refers to the angular distance of the sun north or south of the celestial equator.
* Winter Solstice: This occurs around December 21st or 22nd in the Northern Hemisphere, when the sun's declination is furthest south (around -23.5 degrees). This is why the Northern Hemisphere experiences its shortest day and longest night.
The opposite occurs during the Summer Solstice, when the sun's declination is most northerly.
