What term describes book-length collections of calendars, useful facts, and advice published for practical use?

• A. Ephemerides
• B. Almanacs
• C. Portfolios
• D. Treatises

Answer: (B)

An almanac is an annual, book-length reference designed for everyday use, combining a calendar for the year with a range of practical information, such as weather notes, astronomical data, planting or nautical guidance, and handy tips. That blend of a calendar with useful facts and advice is precisely what an almanac provides, making it the best fit for describing book-length collections published for practical use. Ephemerides are focused tables of celestial positions and events for astronomers or navigators, not broad practical guides. Portfolios refer to collections of documents or investments, not yearly reference manuals. Treatises are scholarly expositions on particular subjects, not annual practical handbooks.