The description and use of a joynt-rule fitted with lines for the finding the hour of the day and azimuth of the sun, to any particular latitude, or, to apply the same generally to any latitude : together with all the uses of Gunters quadrant applyed thereunto ... / contriv'd & written by J. Brown, philomath.

About this Item

Title
The description and use of a joynt-rule fitted with lines for the finding the hour of the day and azimuth of the sun, to any particular latitude, or, to apply the same generally to any latitude : together with all the uses of Gunters quadrant applyed thereunto ... / contriv'd & written by J. Brown, philomath.
Author
Brown, John, philomath.
Publication
London :: Printed by T.J. for J. Brown and H. Sutton, and sold at their houses,
1661.
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Subject terms
Quadrant.
Dialing.
Mathematical instruments.
Link to this Item
http://name.umdl.umich.edu/A29756.0001.001
Cite this Item
"The description and use of a joynt-rule fitted with lines for the finding the hour of the day and azimuth of the sun, to any particular latitude, or, to apply the same generally to any latitude : together with all the uses of Gunters quadrant applyed thereunto ... / contriv'd & written by J. Brown, philomath." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A29756.0001.001. University of Michigan Library Digital Collections. Accessed June 13, 2024.

Pages

3 To finde the stars rising and set∣ting, lay the thread on the star among the moneths, and in the line of hours it shews the stars rising and setting, as you counted for the Sun; but yet note this is not the time in common hours, but is thus found: Adde the

Page 31

complement of the Suns Ascension, and the stars right Ascension, and the stars hour last found together, and the Sun, if less than 12; or the remain 12 being substracted, shall be the time of his rising in common hours; but for his setting, adde the stars setting last found to the other numbers, and the sum or difference shall be the set∣ting.

Example.

For the Bulls-eye on the 23 of De∣cember, it riseth at 2 in the afternoon, and sets at 4. 46 in the morning.

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