A New Treatise On the Use of the Globes And Practical Astronomy Or a Comprehe
A New Treatise On the Use of the Globes And Practical Astronomy Or a Comprehe
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Of the place, or equal to the lat. Of the place whose horizon is parallel to its surface. In the same manner the hour lines may be calculated, when the sha- dow is projected upon a plane, in any other position. See sect. 1 of Emerson's Dialling. Remark. It appears from the above observations, as the whole earth is but a point in comparison of the heavens, that if a small sphere of glass be placed on any part of the earth's surface, having an opake axis parallel to the axis of the earth, and suc...h lines upon it, and such a plane within it as above described ; it will shew the hour of the day as correctly as if it were placed at the earth's cen- tre, and the whole body of the earth were as transparent as crystal, PROB. 76. To make a horizontal dial for any latitude. Rule. ELEVATE the pole as many degrees above the horizon as are equal to the given latitude ; bring aries to the brass meridian, and set the index^to 12 ; then turn the globe westward until the in- dex has passed over 1, 2, 3, 4, 5 and 6 hours successively, and mark the degree cut on the horizon by the equinoctial colure, at each respective hour, reckoning from the north or south points, these will be the distances of the hour lines from noon until 6 o'clock at night : And as the hour of I and 11, 2 and 10, 3 and 9, Sec.
What to read after A New Treatise On the Use of the Globes And Practical Astronomy Or a Comprehe?
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To quickly assess the difficulty of the text, read a short excerpt:
Of the place, or equal to the lat. Of the place whose horizon is parallel to its surface. In the same manner the hour lines may be calculated, when the sha- dow is projected upon a plane, in any other position. See sect. 1 of Emerson's Dialling. Remark. It appears from the above observations, as the whole earth is but a point in comparison of the heavens, that if a small sphere of glass be placed on any part of the earth's surface, having an opake axis parallel to the axis of the earth, and suc...h lines upon it, and such a plane within it as above described ; it will shew the hour of the day as correctly as if it were placed at the earth's cen- tre, and the whole body of the earth were as transparent as crystal, PROB. 76. To make a horizontal dial for any latitude. Rule. ELEVATE the pole as many degrees above the horizon as are equal to the given latitude ; bring aries to the brass meridian, and set the index^to 12 ; then turn the globe westward until the in- dex has passed over 1, 2, 3, 4, 5 and 6 hours successively, and mark the degree cut on the horizon by the equinoctial colure, at each respective hour, reckoning from the north or south points, these will be the distances of the hour lines from noon until 6 o'clock at night : And as the hour of I and 11, 2 and 10, 3 and 9, Sec.
What to read after A New Treatise On the Use of the Globes And Practical Astronomy Or a Comprehe?
You can find similar books in the "Read Also" column, or choose other free books by J James Wallace to read onlineMoreLess
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