Huso horario, cambio estacional de hora y horarios en España.

The article is about time zones, daylight saving time, and schedules in Spain. It mentions that the existence of pre-established schedules is a complexity of human society and that the optimal functioning of schedules requires a mechanical clock synchronized with the cycle of light and darkness. It also talks about the standardization of time zones and the need to adopt broad references in each country. Additionally, it mentions the seasonal variation of sunrise time and how this affects the organization of social activity through schedules. The article also analyzes work schedules in Spain and how they differ from European standards. According to employment survey data, early work schedules in Spain are not caused by the current time zone. [Extracted from the article]