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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1725 Excerpt: ...or Setting, &c. that Day, as is hewn in the following Problems. Only it must be remembred, that in Order t6 solve such Problems, as relate to the Time of any such Thenomenon, the HourIndex must always be put exactly to 12 on the Hour-Circle, before the Sun's Place be moved from the Meri dians and also special Care must be Chap.x. taken, that the Hour-Index moves sw duly round with the Body of the Globe. PROBLEM VI. To find the Time of the S u N's RJJing and Setting, and its Amplitude, at any Tlace or Time given. THE Globe being (by 'Problem 5.) duly ordered and prepared, turn the Globe, till the Degree of the Ecliptick, wherein the Sun is for the Day given, comes to the East-Side of the Horizon; the Hour-Index will then shew upon the Hour-Circle the Time of the Sun's Rising: and tha Degrees of the Horizon, intercepted between the true east Point, and that Point of the Horizon the Sun's Place comes to, Ihew its Morning Amplu K 3 tude, chap. X. tude, this being the Distance of the xv' point of the Horizon where the Sun rises, from the true east Point of the Horizon. In like manner, the Degree of the Ecliptick, wherein the Sun is, being brought to the west Side of the Horizon, the Hour-Circle will shew the Time of the Sun's Setting; and the Degrees of the Horizon, intercepted between the true west Point, and that Point of the Horizon which the Suns Place is brought to, shew its Evening Amplitude, or how far the Sun sets distant from the true west Point. Where it is to be noted, that the Sun sets so long before or after six in the Evening, as it rises after or before fix in the Morning; and in like manner, the Sun sets so far distant (northward or southward, according to the respective Time of the Year) from the true west Point, as it rises from the t...

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