Which of the following sources would be the most helpful to a farmer who is trying to determine the date of a full moon in a particular month?

Question

Quizplus · Accepted Answer

An almanac is an annual calendar containing important dates and statistical information such as astronomical data and tide tables.
Encyclopedia is incorrect. An encyclopedia is most useful for finding facts on a variety of subjects. 
Style guide is incorrect. A style guide is most useful for determining proper punctuation. It contains a set of standards for the writing and design of documents.
Thesaurus is incorrect. A thesaurus is a book that lists words in groups of synonyms and related concepts.

Which of the Following Sources Would Be the Most Helpful