Sentence:  While accounts of the progress of the tsunami came in from various points in the Pacific ( Midway reported it was covered with nine feet of water ) , the Hawaiian station made its calculations and notified the military services and the police that the first big wave would arrive at Honolulu at 23 : 30 <WSD>Greenwich</WSD> time . 
Meaning of the word marked with <WSD> tags:  the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere