These are one of the most interesting rural architectural styles in France, with many examples still in existence in north-east Aquitaine. Originally the pigeonniers were used for breeding and raising pigeons for food to the owners. Their characteristics typically include:
Thatâs logical, but not the case, for Earth. Instead, Earth has seasons because our planetâs axis of rotation is tilted at an angle of 23.5 degrees relative to our orbital plane â the plane of Earthâs orbit around the sun. The tilt in the axis of the Earth is called its obliquity by scientists.
There are a few reasons why seasonal dates can vary from year to year. 1  A year is not an even number of days and neither are the seasons. 2  Another reason is that the Earth's elliptical orbit is changing its orientation relative to the Sun (it skews), which causes the Earth's axis to constantly point in a different direction, called precession.