The planet Venus orbits the Sun every 225 days. Because of its elliptical orbit, the distance between Venus and the Sun periodically increases and decreases. The maximum distance of Venus from the Sun is 108.9 million kilometers, and the minimum distance of Venus from the Sun is 107.5 million kilometers. The planet reaches each of its maximum distance and minimum distance from the Sun once every 225 days. The sinusoidal function , given by , models the distance, in millions of kilometers, between Venus and the Sun as a function of time , in days. Based on the function , Venus is at its maximum distance from the Sun at time days.