I am reposting last year's post about the March equinox, as so many readers have asked for the sunrise chart again.
With the March equinox, the seasons officially change to autumn in the south and spring in the north. "Officially" is the operative word here, for timing of the changes of the seasons is much less precise than we often think. There are not precisely 365 days to a year, so the equinoxes do not fall on the same day every year, or at the same time.
Myths about the equinoxes abound.
- It is said that the equinox is a day when the amount of time of light and dark is precisely equal. It usually occurs a day or two before or after. (Hence the name, which translates as "equal night")
- It is also said that the equinox brings a time of storms, but actually, record keepers checking back over 75 years have found that not only are there no extra storms, it is often a calmer period around the equinox.
- Some people seem to think that on the vernal equinox, it is possible to balance an egg on its point. The success or failure of this peculiar activity has nothing to do with what day of the year it is.
In spite of misunderstandings and silliness, the basic idea of equilibrium is true.
- The equinoxes are the only days of the year when the tilt of the earth's axis and its orbit bring it to a point where it is straight in relation to the sun. (An excellent graphic for this can be found here: http://www.kidsgeo.com/geography-for-kids/0020-solstices-and-equinoxes.php)
- Thus the equinoxes are also the only days of the year when the sunrise is due east and the sunset due west.
- For those who live on the equator, the equinoxes are the only days when the sun passes directly overhead. (See http://news.nationalgeographic.com/news/2009/03/090319-vernal-equinox-2009-spring.html)
The days are important, but how to share an understanding with little ones without it getting too complicated?
Very young children are not really interested in how the earth goes round the sun or at what angle it tilts. They have only been through four or fine years and so the concept of an entire year may not be entirely firm in their minds. Day and night, however, are completely familiar to them, as are sunrises and sunsets.
Play a Sunrise Game
You will need enough yellow or orange paper for each child and a globe. Ask each child to cut out a large circle from their paper and colour or paint it to be the sun. Divide the children into three groups, standing. The group in the middle lives on the equator, which you indicate on the globe. They hold their suns over their heads. The group to the right lives in the northern hemisphere, so they hold their suns to their side, toward the equator, as does the group to the other side, the southern hemisphere. Have them all turn to the "east" to make a sunrise. Those in the north and south keep their suns inclined and those on the equator keep their suns direct as they raise them up high and then turn and have them set in the "west". Emphasize that this equinox is the spring equinox in the north and the autumn equinox in the south. Hang the suns up all over the room for good cheer.
Encourage Solar Observation
Do NOT encourage the children to look directly at the sun. Do encourage them to notice, every day in the morning, where the sunrise is in relation to their world. If they live where they cannot actually see the sun in the morning, they can note where they first see its rays or where the light is brightest when they have breakfast. Download the Sunrise Chart above, number the squares for the month, and make enough copies for each child to have one. When they arrive in the morning, before they forget, have them draw in that day's square the object, room, building, or tree, etc. where they first saw the sun's rays that day. This will help them to see that the sunrise shifts as the year goes by, and will help make the lessons about the earth's orbiting that much easier to understand.
©2010 Anne Morddel
Seasons South and North
