Alunar occultation occurs when the moon passes in front of a background star or other object. suppose it takes 0.015 seconds for the moon to completely cover a background star. what is the star's angular size in arcseconds? you'll need to know the moon's angular speed on the celestial sphere, which can be found using the answer to problem 4. (sorry about all the unit conversions.) suppose the star's distance is 100 parsecs. what is its diameter? you will need to use the small angle formula.