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" ... not be difficult to conceive how astronomers are able to foretel the exact time when any phenomenon of this kind will happen. For as an eclipse can only take place at the time of a new or full moon, the chief requisites are to determine the number... "
Lectures on Experimental Philosophy, Astronomy, and Chemistry: Intended ... - Page 25
by George Gregory - 1808
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The Polyanthos

1814 - 378 pages
...will take place in every year, and the true situations of the sun and moon, in each of their orbits at those times ; and if from this it appears that the two luminaries are within the proper lim- ' its of the node, there will be an eclipse ; otherwise, none will be occasioned, for reasons...
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An Introduction to Astronomy ...

John Bonnycastle - Astronomy - 1816 - 490 pages
...happen. For as an eclipse can only take place at the time of a new or full moon, the chief requisites are to determine the number of mean conjunctions and oppositions...are within the proper limits of the node, there will be an eclipse, or otherwise not, agreeably to what has been already observed upon this subject. But...
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The American Practical Lunarian: And Seaman's Guide ... To which are Annexed ...

Thomas Arnold - Marine insurance - 1822 - 1008 pages
...For, as an eclipse can only take place at the time of a new or full moon, the chief requisites are to determine the number of mean conjunctions and oppositions...the sun and moon in their orbits at each of those tirm-s. And, if from this it appears that the two luminaries are within the proper limits of the node,...
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