[天] clepsydra

... 娄宿三 Hamal 娄宿一 Sheratan 漏壶 clepsydra ...

[天] drip-vessel

... drift curve 漂描曲线 drip-vessel 漏壶 due east 正东 ...

 water clock

Water Clock(漏壶), 此释义来源于网络辞典。