Stonehenge is aligned to the sunrise at the summer [[solstice]], or longest day of the year, around June 21. On that day the sun shines through the sarsen stone and hits something called the heel stone which lights up like a mirror, as it is made of polished quartz. | Stonehenge is aligned to the sunrise at the summer [[solstice]], or longest day of the year, around June 21. On that day the sun shines through the sarsen stone and hits something called the heel stone which lights up like a mirror, as it is made of polished quartz. |