# Popular Lectures on Theosophy

Read Books, 2008 - Body, Mind & Spirit - 188 pages
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)

Annie Besant nee Wood, 1 October 1847 - 20 September 1933) was a prominent British Theosophist, women's rights activist, writer and orator and supporter of Irish and Indian self rule. She was married at 19 to Frank Besant but separated from him over religious differences. She then became a prominent speaker for the National Secular Society (NCS) and writer and a close friend of Charles Bradlaugh. In 1877 they were prosecuted for publishing a book by birth control campaigner Charles Knowlton. The scandal made them famous and Bradlaugh was elected Member of Parliament for Northampton in 1880. She became involved with Union organisers including the Bloody Sunday demonstration and the London matchgirls strike of 1888 and was a leading speaker for the Fabian Society and the Marxist Social Democratic Federation (SDF). She was elected to the London School Board for Tower Hamlets, topping the poll even though few women were qualified to vote at that time. In 1890 Besant met Helena Blavatsky and over the next few years her interest in Theosophy grew while her interest in secular matters waned. She became a member of the Society and a highly successful lecturer in Theosophy. As part of her Theosophy-related work, she travelled to India where in 1898 she helped establish the Central Hindu College, and in 1902 she established the first overseas Lodge of the International Order of Co-Freemasonry, Le Droit Humain in England. Over the next few years she established lodges in many parts of the British Empire. In 1907 she became President of the Theosophical Society.