4. To finde the time of the southing of any star on the Rule, or any other whose right ascension and declination is known, Substract the Suns right ascension from the stars, increased by 24, when you cannot do without, and the remainder, if less than 12, is the time required, in the afternoon or night before 12; but if there remain more than 12, substract 12, and the residue is the time from mid-night to mid-day following.
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.
- 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 May 16, 2024.
Pages
Page 32
Example.
Lyons-heart on the tenth of March, the Suns Ascension is 0 2'.
Lyons-heart whole right asc. is 9 50' Time of southing is 9 48' at night.