Dec 23, 2022
Enhance your UPSC CSE preparation with our daily dose of Current Affairs wherein we discuss topics that make news at National and International level.
In today's edition of our Current Affairs, we will discuss What is The Concept Behind Winter Solstice. The topic's relevance to the UPSC CSE syllabus is mentioned below.
For Prelims: Indian and World Geography
Winter Solstice, Northern Hemisphere, Southern Hemisphere, Summer Solstice, Solar System, Earth's Tilt, Poles, Equator, Latitudes.
For Mains: GS Paper I- Climatology
About the Winter Solstice, Reasons for the change in the hours of daylight, Winter Solstice in India.
December 22 is Winter Solstice in the Northern Hemisphere. Whereas in the Southern Hemisphere, it is the Summer Solstice in places like Australia, New Zealand, or South Africa.
Explain the concepts of “Solstice” and “Equinox”. (150 words, 10 marks)
This tilt is combined with factors such as Earth’s spin and orbit and leads to variations in the duration of Sunlight that any location on the planet receives on different days of the year.
The tilt is also responsible for the different seasons that we see on Earth. The day occurs on the side facing the Sun, and changes to night as Earth continues to spin on its axis.
The Northern Hemisphere spends half the year tilted in the direction of the Sun, getting direct sunlight during long summer days. During the other half of the year, it tilts away from the Sun, and the days are shorter.
The Earth’s tilt helps define some familiar imaginary lines, which are also key to determining when a Solstice occurs. These are latitudes, which are a measure of a location’s distance from the Equator.
The Earth’s North Pole points towards the North Star over an extended period, as the Earth moves around the Sun over the course of a year.
Winter Solstice, December 22, is the day when the North Pole is most tilted away from the Sun.
During summer in either hemisphere, that pole is tilted towards the Sun and the polar region receives 24 hours of daylight for months. Likewise, During winter, the region is in total darkness for months.
At latitudes of 23.5° (matching the tilt) are the Tropics of Cancer and Capricorn, north and south of the Equator. At 66.5° (or 90° minus 23.5°) are the Arctic and Antarctic Circles, to the north and south.
It is at latitudes higher than 66.5° (in either direction) that days of constant darkness or light occur.
News Source: The Indian Express and the DNA India
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