Most people know that theSun 'rises in the east and sets in the west'.However, most people don't realize that is a generalization.Actually, the Sun only rises due east and sets due west on2 days of the year -- the spring and fall equinoxes!On other days, the Sun rises either north or south of 'due east'and sets north or south of 'due west.'

Each day the rising and settingpoints change slightly. At the summer solstice, the Sun rises as farto the northeast as it ever does, and sets as far to the northwest.Every day after that, the Sun rises a tiny bit further south.

Atthe fall equinox, the Sun rises due east and sets due west. Itcontinues on it's journey southward until, at the winter solstice, the Sun rises are far to the south as it ever does,and sets as far to the southwest.

Many, if not most, prehistoric cultures tracked theserising and settings points with great detail.If they had jagged mountains along the horizon, the exact points could bereadily remembered. Without a suitably interesting horizon, standing stonescould be arranged to line up withthe various rising and setting points. Or, tree poles could replacethe standing stones. Or, rock cairns could be used.

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The cost of a hiring a phone installer in your area is between $50 and $80 per hour. A complete installation requires one to two hours per jack, for a total cost of $50 to $160. This process assumes you need to run wire from the telephone pole to the location in your house where you want the phone jack installed. Redeem your rewards or check your reward status. Learn more about how it works. We would like to show you a description here but the site won’t allow us. Most popular dictionary of acronyms and abbreviations. All Acronyms helps to find acronym or abbreviation meaning as well as best ways to abbreviate any word. I am trying to install a phone jack in my bedroom and there already exists a grey telephone wire in the room. So I went to Home Depot and bought a plastic phone jack for it. The phone jack has 4 wires on it which are: red, yellow, green, and black. Except that the phone wire coming out.

The dioramas simulate the rising and setting points of the Sun,and its tracks across the sky at summer solstice(longest track), winter solstice (shortest track), and the spring and fallequinoxes (medium track). A bead placed on one of the trackssimulates the Sun rising along the eastern horizon, travelong along the sky,and setting on the western horizon.

Imagine a tiny version of yourself standing in the middle of the wooden disk. Andimagine that the outside rim of the disk represents your horizon. On SummerSolstice, you would see the Sun rise on your 'horizon' at the eastern point of thelongest track. It would follow the track high in your sky, and eventuallyset on the western horizon. It would be up for about 17 'hours', thus makingsummertime days long and warm.On the Winter Solstice, you would observe the Sun rising at the western end of thesmallest track. It wouldn't rise high in the sky, and would be up for only about6 or 7 hours, making your days short on daylight and cold.At the Spring and the Fall equinoxes, the Sun would rise at the east end of the middletrack and set at the west end. Your days would be exactly half daylight and half nighttimeand you would experience typical warm/cool spring and fall climates.

Build your own Sun Track Diorama

What about the stars?

The rising points of the stars don't change as much as the Sun's becausethey are so very far away. So the rising points of stars on the horizon werenot as critical to ancient cultures.However, the rising times of stars change by 4 minutes each day, soany particular star would rise at different times during the year. Forabout half the time, the star would rise during the daytime and thus beblocked by the huge light of our Sun.

There was something calledthe 'heliacal' or dawn rise of a star -- and this happened on only one day ofthe year.Thus these dawn rising were extremely useful for keeping track of exact days.For an explanation and examples of heliacal or dawn risings of stars, seeShow Me a Heliacal Rising.

Image credits:

Medicine Wheel sunset photograph by Tom Melham.The Tom Melham picture appeared in the National Geographic. According to them, it is part of a collection'Mysteries of Mankind: Earth's Unexplained Landmarks' and the imageis listedas usuable, with no permission or payment required. Just need togive credit, which is: Medicine Wheel sunset photograph by Tom Melham.

Native American Suntrack Diorama photo and design by Ginger Armstrong, Kelseyville, CA.

Seasons Suntrack Diorama photo by Ben Buress, Chabot Space and Science Center.

Suntrack dioramas designed by Deborah Scherrer and Barbara Scherrer.

A preposition describes a relationship between other words in a sentence. In itself, a word like 'in' or 'after' is rather meaningless and hard to define in mere words. For instance, when you do try to define a preposition like 'in' or 'between' or 'on,' you invariably use your hands to show how something is situated in relationship to something else. Prepositions are nearly always combined with other words in structures called prepositional phrases. Prepositional phrases can be made up of a million different words, but they tend to be built the same: a preposition followed by a determiner and an adjective or two, followed by a pronoun or noun (called the object of the preposition). This whole phrase, in turn, takes on a modifying role, acting as an adjective or an adverb, locating something in time and space, modifying a noun, or telling when or where or under what conditions something happened.

Consider the professor's desk and all the prepositional phrases we can use while talking about it.

You can sit before the desk (or in front of the desk). The professor can sit on the desk (when he's being informal) or behind the desk, and then his feet are under the desk or beneath the desk. He can stand beside the desk (meaning next to the desk), before the desk, between the desk and you, or even on the desk (if he's really strange). If he's clumsy, he can bump into the desk or try to walk through the desk (and stuff would fall off the desk). Passing his hands over the desk or resting his elbows upon the desk, he often looks across the desk and speaks of the desk or concerning the desk as if there were nothing else like the desk. Because he thinks of nothing except the desk, sometimes you wonder about the desk, what's in the desk, what he paid for the desk, and if he could live without the desk. You can walk toward the desk, to the desk, around the desk, by the desk, and even past the desk while he sits at the desk or leans against the desk.
All of this happens, of course, in time: during the class, before the class, until the class, throughout the class, after the class, etc. And the professor can sit there in a bad mood [another adverbial construction].

Those words in bold blue font are all prepositions. Some prepositions do other things besides locate in space or time — 'My brother is like my father.' 'Everyone in the class except me got the answer.' — but nearly all of them modify in one way or another. It is possible for a preposition phrase to act as a noun — 'During a church service is not a good time to discuss picnic plans' or 'In the South Pacific is where I long to be' — but this is seldom appropriate in formal or academic writing.

Click HERE for a list of common prepositions that will be easy to print out.

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