The Royal Observatory, Greenwich is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north. The Royal Observatory was constructed in 1675 during Charles 111's reign. The Meridian Line (start of GMT) passes through it. United Kingdom.

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Keywords: 111, =oldest, architecture, astronomical, britain, charles, great, greenwich, institution, kingdom, line, london, meridian, observatory, park, reign, research, river, royal, scientific, thames, united