The Whys And Wherefores of Navigation
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CIRCUH- OR EX-MERIDIAN ALTITUDE It frequently happens, especially in the higher latitudes, that an aggravating mass of cloud drives over the sun or other objects that you are chasing, with the tangent screw, and it is lost from view together with all hope of a meridian altitude. But such an unfortunate occurrence as the loss of the mid-day latitude may be averted by employing the Cir cum-meridian sight or Ex-meridian, as our English cousins call it. The mariner accustomed to its use "shoots" th...e sun and notes the time by chronometer or watch. Or on cloudy days, he would be standing by, near apparent noon watch ing for a chance to catch a glimpse of the object through a rift of cloud, and thereby forestall the loss of his lati tude. The theory of this observation is extremely simple, being merely to add to the observed altitude, taken before or after apparent noon when the sun is being considered, the amount of rise or fall between the time of sight and the time of cul mination, and proceed with this amended altitude as in an ordinary meridian altitude sight.
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You can find similar books in the "Read Also" column, or choose other free books by Gershom Bradford to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
CIRCUH- OR EX-MERIDIAN ALTITUDE It frequently happens, especially in the higher latitudes, that an aggravating mass of cloud drives over the sun or other objects that you are chasing, with the tangent screw, and it is lost from view together with all hope of a meridian altitude. But such an unfortunate occurrence as the loss of the mid-day latitude may be averted by employing the Cir cum-meridian sight or Ex-meridian, as our English cousins call it. The mariner accustomed to its use "shoots" th...e sun and notes the time by chronometer or watch. Or on cloudy days, he would be standing by, near apparent noon watch ing for a chance to catch a glimpse of the object through a rift of cloud, and thereby forestall the loss of his lati tude. The theory of this observation is extremely simple, being merely to add to the observed altitude, taken before or after apparent noon when the sun is being considered, the amount of rise or fall between the time of sight and the time of cul mination, and proceed with this amended altitude as in an ordinary meridian altitude sight.
What to read after The Whys And Wherefores of Navigation?
You can find similar books in the "Read Also" column, or choose other free books by Gershom Bradford to read onlineMoreLess
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