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Can your sundial really tell the time?

by: Hugh Harris-Evans

"I am a sundial, and I make a botch
Of what is done far better by a watch"

So wrote Hilaire Belloc, but is this really fair? Sundials are the earliest known form of time-keeping having been used for some five thousand years. The Greek historian Herodotus stated that sundials were first used by the Chaldeans and Sumerians in Babylonia which was part of the modern Iraq. They used vertical rods on their buildings and noted the position of the shadow to record the passing of the hours. The concept was developed by the Greeks and Romans who constructed various different shapes of dial to enable them to tell the time and the season of the year. Usually these were bowl-shaped dials with vertical or horizontal gnomons (shadow-casters) and hour lines marked in the hollow of the bowl. Over the years more elaborate designs were produced until the advent of accurate clocks when the function of the sundial became more decorative than as a reliable means of telling the time.

The question is often asked "Can a sundial really tell the correct time?" to which you will receive the Alice in Wonderland reply that it depends upon what you mean by "the correct time". Our clocks and watches work on the basis of there being exactly twenty-four hours between one day and the next but, because of the eliptical nature of the earth's orbit around the sun, the time shown on the sundial will vary according to the seasons. In February by the clock the sun is almost fifteen minutes slow, whereas during the spring and summer months it gains and loses between four and six minutes in two cycles. At the other extreme in November the sundial appears to be some seventeen minutes fast. In fact the sundial is accurate on only four days of the year, about April 15, June 14, September 2 and December 25. Some sundials include a table showing the deviation from "clock time" according to the date.

The time indicated by the sun will also vary with the location of the dial. The sun travels across the sky at the rate of fifteen degrees per hour so every degree of longditude represents a difference of four minutes from the standard meridian for the region. The angle of the gnomon also depends on the situation, so to set up your sundial correctly you need to know both the latitude and longditude of its location. For the United States and the United Kingdom this site can provide the information: http://www.spot-on-sundials.co.uk/latitude.html
The gnomon should be set at the angle in degrees which is equal to the latitude of your location. The sundial can then be fixed with the gnomon pointing to the Pole Star. There are various ways of achieving this, the easiest of which, is to use a compass adjusted for the magnetic variation. Further details are beyond the scope of this article, but for those interested look at this site: http://www.sundials.co.uk/setup.htm

If you have read this far you will have discovered that there is a great deal more to the sundial than a mere item of garden decoration. If this has piqued your interest in the subject, then you are not alone. There are Sundial Societies in countries around the world. The North American Sundial Society has details of its objects and activities on its website: http://www.sundials.org/

A number of sundial trails have been established. A good example is the Thames Sundial Trail in London, England: http://www.sundials.co.uk/~thames.htm
This site lists a number of other trails in countries all over the world but only two in the United States. However the North American Sundial Society has a complete list on its website.

Two rather different designs are shown here. The first, which is commonly referred to as a Human Sundial, uses the person's shadow to indicate the time. By standing in the appropriate box for the date the shadow will show the correct time: http://users.argonet.co.uk/education/sunclocks/
The second is a Digital Sundial which sounds like a contradiction in terms but in reality is just a rather clever design: http://www.digitalsundial.com/

Many sundials have a motto inscribed on the face. Often these are rather serious in tone and of the "Tempus fugit" variety but you also find some written in a lighter vein. Here are a few of my favourites:

The shadow of my finger cast
Divides the future from the past

The clock the time may wrongly tell,
I never if the sun shines well

I stand amid the summer flowers
To tell the passage of the hours

And finally again from Hilaire Belloc:

I am a sundial, turned the wrong way round.
I cost my foolish mistress fifty pounds!

About the author:
Hugh Harris-Evans is the owner of The Garden Supplies Advisor.com a website devoted to gardeners where you will find further articles, gardening tips and product reviews.

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Things You Should Know About Gardening
by: Gerardas Norkus

Gardens come in different varieties like the plants you find in them. There are several gardening tips that can be used for all type of gardens.

1.Mulching protects your garden topsoil from being blown away. It also provides nutrients as it decomposes and improves the appearance of your gardens. Mulching has other benefits and is one of the most recommended gardening tips by gardeners and farmers alike.

2.Healthy plants are more disease resistant. Plant are like people, a person with a strong immune system can combat diseases. A healthy plant does the same.

3. Pests can be eradicated by cleaning the plant with a watery solution of soap. Just make sure to rinse after. This gardening tip is best heeded for fruit bearing trees or edible plants.

4. Using compost fertilizers are a great way to have healthy plants. It is also a great way to save money on expensive fertilizers. Non -organic fertilizers also tend to leave chemical residues that can accumulate in garden soils and harm not only the plants but the gardeners as well. They cause toxins to go to the water supplies. Another gardening tip recommended not just by farmers and gardeners but also by environmentalists.

5. There are several plants that are only suitable for a specified climate, a certain kind of soil or can only grow with certain plants. You have to know what plant grow in the conditions you have in your area this is for you to avoid unnecessary purchases. This is a money saving gardening tip.

6.Landscaping is a good investment which can double the value of your home. This is one gardening tip that can earn you money.

7. Growing grass on bare ground is an easy way to make your home look better and appreciate in value. This is one gardening tip that promotes earning money while growing grass legally.

8. Aside from looking great in your home, trees also provide some sort of protection from direct sunlight exposure and strong winds.

9. Vines on the walls, fences and overhead structures also would offer some protection and would also look great.

10.Flowers are beautiful, but they are also expensive. Get one that is resistant to many elements. Flowers from your local community already have developed resistance to conditions present in your area.

11.For most gardens plants, their roots go only as deep as 6 inches. Putting fertilizer deeper than that would be a waste of money. Put them shallower as they seep down when the plants are being watered.

12.Earthworms are important to plants. They till and aerate the soil for the roots to breathe. Non-organic fertilizers can kill them. This gardening tip dates back to the old days of gardening.

13. Having several kinds of insects that are beneficial to your garden would be good. These insects can be encouraged to stay by having diverse plants in your garden.

14. Spot spraying weeds with household vinegar, instead of using commercial weed-killers, can eradicate them. This is another environment friendly gardening tip.

15. Avoid putting too much mulch on tree trunks, this would encourage unwanted pests to reside on them.

16. Use plant varieties that are common to your area or have been taken from an area with similar conditions.

17. Be sure to know the plants that are poisonous. If you are intent on growing them, make sure to have the necessary cure available in your household. Take note of this gardening tip, it can save your life.

18. The best time to water plants is during mornings.

19. Before planting a new plant in your garden, you must consider its height and size when it matures. This garden tip can help you save money in the future.

20. Newly transplanted plants may require special attention during its first week. This is to reduce the stress and shock it got during transplantation.

And last but not the least of the gardening tips...

21.Plants are living entities. If you want them to grow in your garden you have to treat them as such. They need to be taken care of. They are like your pets, you look out for them. In return you get that feeling of contentment watching them thrive.

A good way to take care of them is to consider that plants might have some feelings too.

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