<Table> <Tr> <Th_colspan="2"> International Meridian Conference </Th> </Tr> <Tr> <Td_colspan="2"> The vertical red line left of the middle is the Greenwich meridian . </Td> </Tr> <Tr> <Th> Host country </Th> <Td> United States </Td> </Tr> <Tr> <Th> Date </Th> <Td> 1 October 1884 (1884 - 10 - 01) </Td> </Tr> <Tr> <Th> Cities </Th> <Td> Washington, D.C. </Td> </Tr> <Tr> <Th> Chair </Th> <Td> C.R.P. Rodgers </Td> </Tr> <Tr> <Th_colspan="2"> Key points </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Establishment of Universal Time </Li> <Li> Agreement of the Greenwich meridian as the international standard for 0 ° longitude </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> International Meridian Conference </Th> </Tr>

When and where was the international prime meridian conference held
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