Letters of Percy Bysshe Shelley, Containing Material Never Before Collected. Edited by Roger Ingpen;

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...earth. r' = radius of moon, or other body. P = moon's horizontal parallax = earth's angular semidiameter as seen from the moon. f = moon's angular semidiameter. Now = P (in circular measure), r'-r = r (in circular measure);.'. r: r':: P: P', or (radius of earth): (radios of moon):: (moon's parallax): (moon's semidiameter). Examples. 1. Taking the moon's horizontal parallax as 57', and its angular diameter as 32', find its radius in miles, assuming the earth's radius to be 4000 miles. Here moon's semidiameter = 16';.-. 4000::: 57': 16';.-. r = 400 16 = 1123 miles. 2. The sun's horizontal parallax being 8"8, and his angular diameter 32V find his diameter in miles. ' Am. 872,727 miles. 3. The synodic period of Venus being 584 days, find the angle gained in each minute of time on the earth round the sun as centre. Am. l"-54 per minute. 4. Find the angular velocity with which Venus crosses the sun's disc, assuming the distances of Venus and the earth from the sun are as 7 to 10, as given by Bode's Law. Since (fig. 50) S V: VA:: 7: 3. But Srhas a relative angular velocity round the sun of l"-54 per minute (see Example 3); therefore, the relative angular velocity of A V round A is greater than this in the ratio of 7: 3, which gives an approximate result of 3"-6 per minute, the true rate being about 4" per minute. Annual ParaUax. 95. We have already seen that no displacement of the observer due to a change of position on the earth's surface could apparently affect the direction of a fixed star. However, as the earth in its annual motion describes an orbit of about 92 million miles radius round the sun, the different positions in space from which an observer views the fixed stars from time to time throughout the year must be separated ...

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About the author (2008)

Born in Field Place, near Horsham in Sussex, Shelley was educated at Syon House Academy and Eton, where he acquired the sobriquet "Mad Shelley" for his independent spirit. While at Eton he published Zastrozzi (1810), a Gothic novel. Expelled from Oxford because he refused to retract his atheistic beliefs, Shelley quarreled with his wealthy father and was banished from home. Shelley married impulsively and then abandoned his young wife to run off to Italy with the 16-year-old Mary Wollstonecraft Godwin (the daughter of the radical feminist and the anarchist philosopher, who was eventually to write Frankenstein). While in Italy, Shelley became close friends with Byron, and the two became objects of endless, notorious rumor. Shelley's personal character was revered by almost everyone who knew him. Extremely generous toward others, frugal with himself, he strove tirelessly for the betterment of humanity. Prometheus Unbound (1820), a lyrical drama in four acts, calls for the regeneration of society through love and for the destruction of all repressive institutions. The Cenci (1819), a verse drama based on real events, is one of the few plays from the romantic period still produced. Shelley's lyrics are marvelously varied and rich in sound and rhythm. Wordsworth regarded him as the best artist among living poets.Adonais (1821), written to honor the memory of John Keats, is one of the supreme elegies in English.The Triumph of Life, which was left incomplete at his death, has been hailed by T. S. Eliot as the nearest approach in English to Dante (see Vol. 2). The "Ode to the West Wind" and "To a Skylark" are anthologized everywhere. Shelley's early death by drowning ended his career just as it was coming into full flower. A revolutionary in his art and life, Shelley is considered by many to be an inspired polemicist and poetic genius. As one of his contemporaries wrote in Etonian (1821), "He is one of the many whom we cannot read without wonder, or without pain. . . .

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