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Royal Observatory Greenwich

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Blackheath Avenue
Greenwich, Greater London SE10 8XJ

April 2019

History of Astronomy Talk: ‘Measuring Time by Astronomy’

April 23 @ 7:00 pm - 9:00 pm
Royal Observatory Greenwich, Blackheath Avenue
Greenwich, Greater London SE10 8XJ
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Atomic Clock Calibrated by Use of Ephemeris Time

Units for measuring time have been realised through the rotation of the Earth - the day. As the precision of clocks improved, it was found that the length of the day was variable. An astronomical solution was to use solar system orbits instead of Earth rotation to define the unit. This resulted in the adoption of Ephemeris Time in the 1950s, which defined the second inherited by today’s atomic clocks. It has also left a problem with ‘leap seconds’ which…

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May 2019

History of Astronomy Talk: ‘The Isaac Newton Telescope: A Historical Perspective’

May 21 @ 7:00 pm - 9:00 pm
Royal Observatory Greenwich, Blackheath Avenue
Greenwich, Greater London SE10 8XJ
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Malcolm Porter will deliver a talk. Talk details to follow soon.   THIS EVENT IS OPEN TO MEMBERS OF THE FLAMSTEED ASTRONOMY SOCIETY ONLY. Please do not book a place on this event if you are not a member of the society. Your booking will be cancelled if your name does not appear on our membership database.

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