Inside Out Library · Explore
Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 168
ument isvertical. The instrument is used daily at sea to measure the altitude of theSun. The chronometer-time at which the altitude is measured isnoted. The method of making the observation is to point thetelescope E at the sea-horizon, which will appear like a horizontalline across its field of… … Fig 91.—Theory of the Sextant. fail on the horizon-glass B (or m in Fig. 90). When the index-armhas been moved so that the image of the Sun (©) appears to touch the horizon —- the index-arm reads the altitude of the Sun on the divided circle. The altitude of the Sun is also measured daily at…Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
More pictures from Elementary astronomy; a beginner's text-book
More like this
