Complex sentence: The Earth rotates at an angular velocity of 15 °/hour, therefore the expression\\ omega --\\ circ\\ times\\ frac gives the interval of time before and after local solar noon that sunrise or sunset will occur.
Split into simpler sentences: The Earth rotates at an angular velocity of 15 °/hour. Therefore, the expression\\ omega --\\ circ\\ times\\ frac gives the interval of time before and after local solar noon that sunrise or sunset will occur.