The description and use of a new portable orrery, on a simple construction, representing the motions and phenomena of the planetary system, but more particularly the motions of the earth and moon round the sun ... To which is prefixed, a short account of the solar system, or the true system of the world The description and use of a new portable orrery, on a simple construction, representing the motions and phenomena of the planetary system, but more particularly the motions of the earth and moon round the sun ... To which is prefixed, a short account of the solar system, or the true system of the world