| |
| | LAT - Online Information article about LAT |
 | | Construction.—Draw a straight line ACB parallel to the top of the ' Strict equality is not necessary, as the observations made are on the vertical line through each division-point, without reference to the others. |
 | | II line, and so on; the hour-line of noon will be the point A itself ; by subdivision of the small arcs Ar, rs, st, andc., we may draw the hour-lines corresponding to halves and quarters, but this only where it can be done without confusion. |
 | | Join CX, then the angle ACX is the hour-angle from noon given by the bead, and we have to prove that this hour-angle is the correct one corresponding to a north latitude DAC, a north declination DAH and an altitude equal to the angle which the sun-line, or its parallel AC, makes with the horizontal. |
| encyclopedia.jrank.org /LAP_LEO/LAT.html (5725 words) |
|