Geography question from Patwari exam, 2024 by JKSSB
Which of the following was NOT considered by Milankovitch in his mathematical model of climate change?
Last updated May 15, 2026
Correct Answer:
Option D —
Changes in the rate of rotation of earth on its axis
The Milankovitch Theory explains the cyclical variations in Earth's climate (specifically the onset of Ice Ages) based on three specific geometric changes in Earth's orbit and orientation. These are:
• (Option B): This refers to the shape of Earth's orbit around the Sun, which fluctuates between being more circular and more elliptical over a cycle of approximately 100,000 years.
• (Option A): This is the change in the angle of inclination of Earth's axis. It varies between 22.1° and 24.5° over a 41,000-year cycle, affecting the intensity of the seasons.
• (Option C): This is the "wobble" of Earth's axis (like a spinning top), which changes the orientation of the axis relative to the stars over a 26,000-year cycle. This is often referred to as the Precession of Equinoxes.
Why D is Incorrect: While the rate of rotation (how fast the Earth spins on its axis) can be affected by tidal friction or mass redistribution over millions of years, it was not one of the three orbital parameters used by Milutin Milankovitch to build his mathematical model of long-term climate change.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
