Sundial sundial installed tilt angle installed 1, north placement. Will have the scale of the sundial facing toward the north; 2, adjust the guide. Adjust the sundial base, just south of the compass pointer; 3, adjust the level. About two blocks to adjust the screw so that the standard bulbs in the small circle in the middle of a small raised blisters; 4, adjust the latitude. Search on the map before measured by the latitude of the location, such as latitude Jiangyin is 32o, Beijing is 40o; and then adjust the sundial face tilt, so that the edge of the column after the board's degree of latitude Alignment; final tightening screws at both ends of the column, the latitude fixed. At this time, sundial face on the ground, it is precisely its tilt angle (90 - the local latitude angle), just at this time sundial pin latitude tilt angle, it points to Polaris and the Earth's axis parallel to the sundial plane parallel to the equator; 5, see video timing. At this time in the sun we can see the surface of the needle shadow sundial given time. The patented design of traditional and modern twelve hour clock system time together. Today, people also know that the traditional hour from the time of the concept. Small system in the round, divided into twelve small cells for one hour, each small cell is five minutes, one cell is ten minutes, an hour is just six in the grid; twelve hour system, each cell is small fifteen minutes, two hours is equivalent to the ancient one hour. 6, see Film Festival set. Adjust the travel form, travel form the needle shadow falls on the center line, according to the video pointed at the location where the meaning of the weather to determine the solar terms. Compared with the sundial, the instrument can have any time to observe the sun shadow recognized solar terms, sundial noon local time only in the meridional direction is to confirm the solar terms. Note: (1) We measured the time is here, local time, not Beijing; (2) This is the single dial, the autumnal equinox to the vernal equinox does not fall during the needle shadow sundial faces, north of the sundial face is in shadow being, then you can adjust the travel table sundial pin the video pointed to a table in the online travel falls, sundial according to the center line and the junction of the grid surface to determine the local time, to make up the other side can not test within six months when the sundial shortcomings. In addition to the production of sundial gnomon must be properly installed, the time line of the characterization can not be ignored. The time line-shaped carved sundial sundial's geographical location, means the height of the clock, have a relationship. Assuming the geographical latitude φ, gnomon height H, to characterize the difference between time and noon for the T; time line and the angle of gnomon A, distance D, the calculation formula of the form of sundial is as follows: (1) horizontal sundial: TAN (A) = TAN (T) * SIN (φ) (2) Equatorial Sundial: Equal disc, quite an hour and fifteen degrees, the vertical line down at noon. (3) polar sundial: D = H * TAN (15 * T) (4) South to the vertical sundial: TAN (A) = TAN (T) * COS (φ) (5) East or West to the vertical: D = H * TAN ((6-T) * 15) (6) lateral vertical: TAN (A) = SIN (O) * TAN (R +15 * T) refers to the angle between the vertical wall clock with TAN (W ) = SIN (θ) * COT (φ