Where did the names of the months of the year come from? Why are there seven days in a week? And how are seasons defined? Find out all the answers and more here. Plus, find out how calendars vary among different cultures around the world.

Observations of the Moon determine the timing of the Islamic year Al Hijra and its months including the holy month of Ramadan. Find out the dates here.

Why change the clocks, which way should they go, and whose idea was it in the first place? British Summer Time explained.

A year on Earth can be split into four as we complete our orbit of the Sun. Each of these are marked by an equinox or solstice.

Whether you are a dragon, a monkey or a rat, Chinese New Year is always spectacular and loud. 

What makes the seasons and exactly when do they begin and end?

Easter falls on a Sunday between 22 March and 25 April, but which Sunday requires an astronomical calculation.

While days and years are (fairly) neat astronomical events, what explains months, weeks, hours and minutes?