 <translate> The relevant sentence in the passage is: In the UK, the Ordnance Datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. So the answer is Newlyn in Cornwall between 1915 and 1921. <yor> Ọ̀rọ̀ tí ó wà nínú àyọkà náà ni pé: Ní UK, Ordnance Datum (ìwọ̀n mítà 0 lórí àwòrán ilẹ̀ UK) jẹ́ ìwọn omi òkun tí wọ́n wọn ní Newlyn ní Cornwall láàárín ọdún 1915 àti 1921. Nítorí náà, ìdáhùn náà ni Newlyn ní Cornwall láàárín ọdún 1915 sí 1921. 