A key to Machan's astronomical mnemonical plates : forming a new system of astronomical mnemonics : or, a correct guide to the constellations...

A key to Machan's astronomical mnemonical plates : forming a new system of astronomical mnemonics : or, a correct guide to the constellations: by means of this system, the planets in their order, their diameters and distances from the sun ; the right ascension and declination of the constellations, and the number of stars in each ; may be permenently fixed in the memory: and also, by it can be known, the times of the rising, southing, and setting of the constellations, and principal stars ; the day of the year on which any known constellation or star rises and sets, at any given hour ; and the times of the sun's rising and setting, et cetera: by a simple mental computation. Contains several fold-outs with schematics showing a grid-like arrangement of constellations representations, for the purpose of mnemonic memorization; not maps