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.
Rights/Permissions
To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
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
5. To finde how long any Star will
be above the Horizon.
Lay the thread to the star, and in
the hour-line it sheweth the ascen∣sional
difference, counting from 90;
then note if the star have North
declination, adde that to 6 hours, and
the sum is half the time; if south, sub∣stract
it from 6, and the residue is half
the time; and the complement of
each to 24 being doubled, is the whole
Nocturnal Arch under the Horizon.
Example.
For the Bulls-eye, his Ascensional
difference will be found to be one
hour, 23 minutes, which added to 6
hours and doubled, makes 14. 46,
the Diurnal Ark of the Star, and
the residue from 24 is 9. 14. for the
descriptionPage 33
Nocturnal Ark, or the time of its be∣ing
under the Horizon.
email
Do you have questions about this content? Need to report a problem?
Please contact us.