Every watch varies but most have a similar system.
When analyzing the pocket watch system this reminisce the sundial and the pendulum. That is, if we assume an equatorial plane, which cuts our planet by Ecuador. In addition, the shadow of a gnomon in the direction of the axis of rotation is moving 15 degrees every hour. Many variables change but it is still a way to measure time. The only important thing is that the item must be parallel to the above, and the gnomon, therefore, must be directed in the North-South.
Naturally, the pocket watch system, which many call the equatorial plane, is inclined to the horizontal plane where we move and walk on the earth's surface, the greater the slope the closer we are from Ecuador. For example, if we are located at the North Pole (or South) clock level coincides with the plane of the horizon, and in the case of being at the equator (i.e. in the city of Quito) the equatorial plane is perpendicular to the ground. In general, the inclination of the equatorial is the complement to 90 degrees of latitude, that is, the co-latitude of the place.
Sundial
The equatorial plane, leaning over our horizon at an angle equal to the colatitudes of the place is, as a sundial. We can see it from our everyday perspective, in our environment! You will be amazed on how many retro models appeared before the latest pocket watch we know today.
This inclined plane, with the stylus or gnomon pointing North is what we can call a Sundial Equatorial Quadrant. If we remember that, every hour, the shadow of the stylus moves about 15 degrees, we can point with lines of different time steps, separated by 15 degrees, as well as half-hours, quarter hours, etc. Thus there is then the first basic design of the sundial. The equatorial dial, which is the easiest construction:
Horizontal Quadrant
A horizontal dial clock is simply a horizontal plane in which the gnomon, whose shadow indicates the hours, is directed toward the north, on the meridian of the place.
A quality pocket watch design is indicative of the hours, which start from the point where the stylus is fixed. It does not have a separation of 15 degrees as the equator. It is necessary to use plane trigonometry to determine them. In practice, these radios can be noted from use as a reference template of a clock dial equator.
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