A Key To Machan's Astronomical Mnemonical Plates is a book written by R. Machan in 1824. The book introduces a new system of astronomical mnemonics that serves as a guide to the constellations. The system is designed to help readers memorize the positions and names of stars and constellations more easily. The book includes a series of mnemonic plates that are meant to aid in memorization. These plates feature images of the constellations and the stars within them, along with accompanying text. The book provides a comprehensive guide to the constellations, including their history, mythology, and scientific significance. It is a valuable resource for anyone interested in astronomy or looking to improve their knowledge of the night sky.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.