What causes the seasons ?

http://www.guardian.co.uk/uk/2013/ju...er-summer-rain

Followed a month later -

http://www.itv.com/news/2013-07-16/w...ous-heatwaves/

To answer the cause of the seasons requires two additional questions - what causes the daylight/darkness cycle each 24 hours ? and the second question - what causes the polar daylight/darkness cycle lasting 12 months and arising from a separate dynamical cause ?.

Of course this requires experts.