Astronomy & time

Measuring the Universe

This video explains how we can measure the distance to near and far objects in the universe using parallax, 'standard candles' and the Doppler effect.

Oktoberfest Sci-Fi-Universe graphic
While astronomers have studied the skies through their telescopes, science fiction writers and filmmakers have helped us to imagine what it...
Star trails and stepping stones by Steph Hall
Step-by-step guides on how to achieve the best results, from getting the right gear through to processing.

Astronomy fact files

The basic difference between a star and a planet is that a star emits light, but a planet shines by reflected light.
The Sun
The diameter of the Sun is 1,400,000 km (840,000 miles) which is more than 100 times the diameter of the Earth.

Time fact files

Digital longitude display from world globe in Time Gallery, ROG (crop)
At 1.00 am GMT on Sunday 27 October 2013 clocks go back one hour. Find out more about BST in our fact file.
Harrison's Marine Chronometer (H4)
Harrison's marine timekeepers are the centrepiece of a permanent display at the Royal Observatory.

Doctor Who Confidential

Karen Gillan (aka Doctor Who's Amy Pond) visits the Royal Observatory Greenwich.

Clip from Doctor Who Confidential, Series 5 Ep. 11: Extra Time. First broadcast BBC Three, 7:30pm 12 June 2010. Used by permission.

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