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Halloween is a strange holiday. At the end of October, children dress up as ghosts and goblins and go from neighbor to neighbor saying "trick or treat." Pumpkins are carved with faces and lit from within. What is all this about and what does it have to do with the Earth and the Sun?
Like many other holidays, Halloween is a mixture of traditions. Its name is shortened from All Hallows Even. "Even" is a form of "eve," meaning the night before an event and something "hallowed" is sacred. Halloween is the night before All Saints Day, which is then followed on November 2 by All Souls Day. In the Roman Catholic and Anglican churches, they commemorate the saints and pray for the souls of the dead.
However the scary costumes are remnants of ancient Celtic religion. About 2500 years ago, the Celts spread through central Europe, the British Isles, Spain and into parts of what is now the Middle East. To understand how Halloween fits into their beliefs, we need first to consider calendars and seasons.
There is no official and universal definition of seasons. Meteorological seasons are defined according to the weather, and astronomical seasons are based on changes in the altitude of the Sun in the sky due to the tilt of Earth's axis. (This is explained in more detail in "Why Planets Have Seasons" - link at the end of this article.)
Earth's axis is tilted by 23 degrees, so as we orbit the Sun, the amount of sunlight reaching the northern and southern hemispheres varies. Click here for a diagram. You can see that on June 21 and December 21, one hemisphere is tilted the full 23 degrees towards the Sun – these are solstices. On the two days when neither hemisphere tilts towards the Sun, there is an equinox.
Astronomical seasons begin on the two solstices and two equinoxes. In Britain, for example, these four days were called quarter days. They had a certain legal status, including being the days on which rents were due. They were also associated with major religious celebrations, but Christmas - near the December solstice - is the only one that is still widely celebrated.
However the Celtic seasons did not begin on quarter days. In their calendar, the equinoxes and solstices were the midpoints of the seasons which began at the end of October, January, March and June. These days are known as cross-quarter days.
Their new year also started at the end of October in a festival known in Ireland as Samhain (pronounced SO-en). The year was divided into the lighter and darker halves and Samhain was the start of the darker half. The last harvest was in, and death would dominate the natural world as winter deepened.
At Samhain people believed that the boundary between our world and the otherworld became thin, so that the dead and other beings might cross over. Therefore frightening costumes were a kind of protection against wandering ghosts, as were hollowed-out vegetables with frightful carved faces. When this tradition went to America with the Irish, eventually they became the jack-o'-lanterns seen today.
The custom of trick-or-treating was probably not Celtic, but originated with Christians in the Middle Ages. On All Souls Day, people baked special cakes to give to those who came from house to house begging for them. The beggars then prayed for the dead relatives of their benefactors to help them get out of purgatory more quickly and into heaven.
Halloween has become, if anything, a secular holiday in many countries. Yet in places with a strong Roman Catholic tradition, All Saints Day and All Souls Day remain important.
There are also remnants of other cross-quarter day festivals. The best known is May Day, known as Beltane to the Celts. As it was the start of the lighter half of the year, it was a major event in the Celtic year. Oddly, Groundhog Day is another remnant, falling at the beginning of spring. Divination, using a sacred animal, was an important part of ancient spring rituals in many parts of Europe.
So if you're going to a Halloween party, making a child's costume or carving a pumpkin, you are following a tradition stretching back over 25 centuries to an agricultural people whose lives depended on keeping track of the seasons and organizing their resources accordingly. When Halloween comes, we are halfway between an equinox and a solstice in our journey around the Sun.
(1) "All Saints' Day and All Souls' Day" http://www.bbc.co.uk/religion/religions/christianity/holydays/allsaints_1.shtml
(2) "Samhain" http://en.wikipedia.org/wiki/Samhain
There are some ghostly astronomical images on my Pinboard Cosmic Halloween".
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