The Universe and the Earth
UPSC Geography notes on the Universe and the Earth — the solar system, the Earth's motions, latitude and longitude, day length and the seasons.
SyllabusGS I · Salient features of world physical geography
The Earth’s shape, motions and position in the solar system are the foundation of physical geography: they explain latitude and longitude, time zones, day length, insolation and the seasons. Prelims asks these as concept questions; Mains GS I uses them to explain climate and its distribution.
Earth's Revolution and the Seasons
Why the Earth has seasons — axial tilt, revolution, solstices and equinoxes, day length and the overhead Sun — …
Latitude, Longitude and Time
Latitude, longitude, local and standard time, IST at 82°30′E, time zones and the International Date Line, with …
The Universe and the Earth — Practice Questions
UPSC Prelims-pattern practice questions on the Universe and the Earth — solar system, eclipses, tropics, the …
The Universe and the Earth — Quick Revision
One-page UPSC revision of the Universe and the Earth: solar system facts, Earth's shape and motions, latitude, …