a quater moon is a kind of moon phase & the lowest gravitational pull is during a quarter moon & as the gravitational pull of the moon decreases , the height of ocean tides will decrease ->  during the quarter moon phases, the height of ocean tides will be the lowest  a last quarter is a kind of phase of the moon & a first quarter is a kind of phase of the moon ->  quarter moon phases are made of the first quater moon phase and the last quater moon phase  during the quarter moon phases, the height of ocean tides will be the lowest & quarter moon phases are made of the first quater moon phase and the last quater moon phase -> the height of ocean tides will be the lowest during the first quater and the last quater moon phase