Astronomia Britannica exhibiting the doctrine of the sphere, and theory of the planets decimally by trigonometry, and by tables : fitted for the meridian of London ... / by John Newton ...

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Title: Astronomia Britannica exhibiting the doctrine of the sphere, and theory of the planets decimally by trigonometry, and by tables : fitted for the meridian of London ... / by John Newton ...
Author: Newton, John, 1622-1678.
Publication: London :: Printed for the author by R. and W. Leybourn, and are to be sold by Thomas Piercepoint ...,; 1657.
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: Astronomy -- Early works to 1800.; Planetary theory -- Early works to 1800.; Astronomy -- Mathematics -- Early works to 1800.
Link to this Item: http://name.umdl.umich.edu/A52255.0001.001
Cite this Item: "Astronomia Britannica exhibiting the doctrine of the sphere, and theory of the planets decimally by trigonometry, and by tables : fitted for the meridian of London ... / by John Newton ..." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A52255.0001.001. University of Michigan Library Digital Collections. Accessed June 4, 2024.

Pages

CHAP. 31. To finde the time of the visible Conjunction of the Sun and Moon.

USe this Analogie, As the apparent motion in any time assigned (found by the former Chapter) is to the time assigned; so is the parallax of longitude at the true Conjunction to the difference in time between the true and visible Conjunction.

Page 163

This difference in the orientall quadrant must be subtracted from the time of the true Conjunction, in the occidentall quadrant added thereto; so have you the visible Conjunction.

Example.

As the visible halfe hourly motion 22685 co. ar.: 0. 644262
Is to the time assigned 50′: 1. 698970
So parallax longitude 02243: 2. 350829
To the difference betwixt the true and visible Conjunction 04943: 2. 694061
The true Conjunction: 27 21. 95942
Difference subtract: . 04943
The visible Conjunction: 27 21. 90999

At this time finde out the true distance of the Moon from the Sun, as also the parallax of longitude, if they agree it is a signe that the visible Conjunction is truly found, otherwise repeat the former worke till there be a concurrance.

Example

At the visible Conjunction, March: 27 21. 90999
The true distance of the Moone from the Sun: . 0••847
The Parallax of Longitude: . 02775
Their difference: . 00072

which being so small sheweth that the visible Conjunction is precisely enough found.