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Antarctic Circle (66°33′ South Latitude)

The Antarctic Circle is an imaginary line of latitude located at approximately 66°33′ South of the Equator. It marks the southernmost latitude where the Sun can remain continuously above or below the horizon for 24 hours. It is one of the five major circles of latitude on Earth.

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Arctic circle (66°33′ North Latitude)

The Arctic Circle is an imaginary line of latitude located at approximately 66°33′ North of the Equator. It marks the southern boundary of the Arctic region. This latitude is determined by the 23.5° tilt of the Earth's axis.

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Countries through which the Tropic of Capricorn passes

The Tropic of Capricorn is located at approximately 23.5° South latitude. It represents the southernmost latitude where the Sun can be directly overhead at noon during the December Solstice. It passes through 10 countries across three continents.

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Countries crossed by the Tropic of Cancer

The Tropic of Cancer (23°30′ N latitude) is the northernmost latitude where the Sun can be directly overhead at noon (during the June Solstice). It passes through 16 countries across North America, Africa, and Asia.

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Countries through which the Equator (0° Latitude) passes

The Equator is the imaginary line at 0° latitude that divides the Earth into the Northern Hemisphere and Southern Hemisphere. It passes through 13 countries across South America, Africa, and Asia (Indonesia).

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The Zoo-Mastery Advantage

Mastering Zoology optional for UPSC gives you a decisive edge through its scientific precision, diagram-heavy scoring, and concise syllabus that toppers leverage for 300+ marks.

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Why Most Students Fail in Zoology Optional

Many UPSC aspirants choose Zoology optional for its scoring potential but end up with low marks due to its technical demands and common preparation pitfalls.

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Best Zoology Optional Books for UPSC

Choosing the right books is crucial for mastering Zoology as an optional subject in the UPSC Civil Services Exam, as it demands both conceptual depth and diagram-based precision.