How does China set the time of year?

JA Barnwell, commenting on the Chinese new year celebrations in Dublin (Letters, February 22), says we might model ourselves more on the Chinese who view their ancestors with real respect.

The Chinese year is based on lunar months but tied to the solar year, which explains why its date varies but always is around this time of the year.

Twelve lunar months have about 355 days, which is 10-11 days shorter than a solar year. This is why Muslim months like Ramadan move backwards in the civil calendar. The way this is avoided is by adding an extra month from time to time.

I have noticed that the Chinese new year always falls on the second new moon after the winter solstice which would ensure the addition of an extra month as required. I do not know if this is in fact the way the Chinese calendar is fixed but, if not, does anyone know how it synchronises the lunar months with the solar year.

Martin D Stern

Hanover Gardens

Salford M7 4FQ

England