Question

one of christiaan huygens contributions to society of his time was - a description of planetary motions. b development of the cartesian coordinate system. c measurement of time. d description of the particulate nature of light.

Explanation:

• Option A: Johannes Kepler described planetary motions, not Christiaan Huygens.
• Option B: René Descartes developed the Cartesian coordinate system, not Huygens.
• Option C: Christiaan Huygens invented the pendulum clock, which was a significant contribution to the measurement of time.
• Option D: Isaac Newton described the particulate nature of light (corpuscular theory), while Huygens proposed the wave - theory of light.

Answer:

C. measurement of time.