Twilight Zones

This chart shows the relationship between the angular elevation of the sun relative to the horizon and levels of twilight. The values are for the 24 hours between 1pm BST 12th August 2010 and 1pm BST 13th August 2010, and for the location Brighton in East Sussex (50.8° N 0.1° W). In equatorial regions, night and day breaks very much more quickly. In Brighton on this late summer day, sunset to full darkness took 2 hours and 22 minutes. By comparison, in Singapore (near the equator) the process took 1 hour 11 minutes.

A full listing of data for the two nights Dominic Alves tried to photograph Perseid meteors is at the foot of this description.

via Dominic Alves

Higher education and wages

Study leave: Plenty of university graduates are working in low-skilled jobs

Young people often worry whether the qualification for which they are studying will stand them in good stead in the workplace. According to the OECD, college and university leavers are better placed in the labour market than their less educated peers, but this advantage is not even in all countries.

Note: Bar represent % of total graduates aged 25-29 working at a low skill level.

via www.economist.com

BP oil spill: The official Deepwater Horizon Disaster Report

BP admitted today its managers on the Deepwater Horizon missed key warning signs in the hours before the explosion aboard the oil rig, but an internal investigation put much of the blame on other companies involved in the well.

A 234-page report described eight main causes for the blast, which killed 11 men and created an environmental disaster. The full report also contained - within the detailed analysis of the operation - a comprehensive, minute-by-minute timeline of every event, as it happened. BP have also produced a graphic video animation.

via www.guardian.co.uk