फलानि ग्रहचारेण सूचयन्ति मनीषिणः ।
को वक्ता तारतम्यस्य तमेकं वेधसं विना ॥
The western concept of precession based on Milankovitch theory proposes (1) eccentricity of the earth’s orbit in cycles of 100,000 years, (2) obliquity in the angle of earth’s axial rotation varying between 22.1˚ and 24.5˚ in cycles of 41,000 years and (3) axial precession of the earth in a cycle of 25,771.5 years. All these three motions together cause variations on the amount of sunlight falling on the earth, particularly at latitudes between 30 and 60 degrees north or south of the equator which eventually offer an explanation for Ice age conditions. However with more researches coming up day by day, many unresolved questions are coming to the fore. Dr Jayasree Saranathan, in continuation of her research paper, presents problems associated with western concept of precession based on Milankovitch theory, and provides information on three cycles of the Indic thought, and the band of Tropic of Cancer.