Finally, for moderate weather, a planet must be tilted to the proper angle and be held in place ​ — in the case of earth, a function fulfilled in part by the gravitational pull of our moon.
पृथ्वी के मामले में, यह काम कुछ हद तक चंद्रमा के गुरुत्वाकर्षण बल से किया जाता है ।