The monument is usually associated with the annual celebration of Summer, the researchers suggested that the great winter festival.

Mike Parker Pearson, archeology professor at the University of Sheffield, suggests that the winter solstice in the past, when people kill and were more pronounced than in the middle of the summer solstice.
He told BBC Radio 4 Today program "in a sense, is the winter solstice as a kind of Neolithic July
"People do together, and focus their resources, both in the sense that it is very difficult to understand why it is so important in the winter with them."
He added: "This will help you to understand that real Stonehenge."

Every year thousands of prehistoric monuments in the bottom of the longest day of the year, but the time spent at the beginning of the season postponed mm.
Heavy rain meant fewer visitors stayed overnight in the last few years up to 20,000 per night to Salisbury Plain, Wiltshire.
Despite the rain, watching the sunrise at 04:52 ET dark clouds loud applause greeted the audience and settlement.
Drums of the old walls are still bad weather, the country dance in the rain.
An English Heritage spokesman said: "14,500 people gathered at Stonehenge on the summer solstice in honor of this year.
"Heavy rain meant the night was one of the lowest voter turnout in recent years.
"But the rain does not stop time, sunrise ceremonies, and when the clouds cover the sun, to the cheers and applause heard the old stones.
"There was heavy rain, somewhere in the night, but he stopped, and if the weather is cloudy, rain or early morning.
"It was wet and muddy, I dare say that in recent years."
Police said 20 were arrested for drugs and alcohol, theft and related crimes in action, but of peace.
Rain today, as the Met Office is a yellow warning time, the West Midlands, East Midlands, Eastern England, South West and South-east London, and although some parts of Scotland's daily report.
Note - the lowest of three levels of severity - 3 Part o'clock noon today, tomorrow and standing water on the road, and the possibility of local flooding.
The storm is estimated at two hours after the Queen to the track around the Royal Ascot horse buggy