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Make your Own Dial – Part I

Make your Own Dial – Part I. D. 1. Draw two perpendicular lines AB, and CD. Where they intersect is O, the origin 2. Draw CB’ from C, using your latitude as the angle between CB’ and CD. 3. Draw a line from the origin O, (where AB and CD

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Make your Own Dial – Part I

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  1. Make your Own Dial – Part I D 1. Draw two perpendicular lines AB, and CD. Where they intersect is O, the origin 2. Draw CB’ from C, using your latitude as the angle between CB’ and CD. 3. Draw a line from the origin O, (where AB and CD cross) perpendicular to CB’. Call this line OP O B’ A B P LAT C

  2. D 4. Draw an arc of length OP with a compass 5. Where the arc passes through the line OD, mark the point N 6. Using the compass with the same length OP, and draw a circle around point N. It should just touch the line AB at the origin point O N O B’ A B P LAT C Make your Own Dial – Part II

  3. Make your Own Dial – Part III D 7. Starting from O, mark every 15 degrees around the edge of the circle 8. Draw lines from N through these circle points until they meet line AB. These are the hour hour points. N O A B C

  4. D 9. Connect point C with each of the hour lines, meeting them across line AB 10. Label the lines from C, starting with line CD as 12 pm. The lines will span the time from 7 am to 5 pm 11. To finish, draw a line parallel to AB through point C and label the ends as 6 am (left) and 6 pm (right) N O A B 7 8 9 10 11 12 1 2 3 4 5 6 6 C Make your Own Dial – Part IV

  5. N W E 8 9 10 11 12 1 2 3 4 S 5 7 6 6 C Make your Own Dial – Part V 12. Draw a triangle gnomon. The acute angle is equal to the latitude. 13. The high side of the triangle may be artistically curved to a pleasing shape 14. The gnomon goes onto the dial face on the C to 12 line, with the gnomon’s acute point placed at C. The dial C to 12 line is pointed north. Then the hypotenuse of the gnomon will be parallel to the earth’s axis of rotation. GNOMON LATITUDE C 12

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