New PDF release: The Star Book: An Introduction to Stargazing and the Solar

By Peter Grego

ISBN-10: 144635878X

ISBN-13: 9781446358788

An creation to Stargazing and the sun System is an introductory part taken from The famous person Book that courses you thru the evening skies, from the heritage and lives of the celebrities, to deep-sky gadgets past the Milky method, and the Celestial Sphere.

via an introductory consultant to the sunlight approach with top of the range photos and observational drawings of the planets, overlaying the solar, Moon, Inferior and more desirable planets. everyone seems to be drawn to the celebrities and on a transparent evening astonished by way of them. The celebrity Book will solution any questions you could have if you lookup into the evening sky.

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Extra resources for The Star Book: An Introduction to Stargazing and the Solar System

Sample text

The block was set level on the ground with the help of wedges, and so placed that the smooth face looked due east. 7 Rolemy's plinth, for measuring the angle of elevation of the noon sun. 8 The triquetrum. This specimen, used by Copernicus, eventually passed into Tycho Brahe's possession. ^^==^ 37 was a horizontal shadow on a uradiiated quadrant of arc engraved on the top soiitlirrii roriHT of this face It is true that the use of the triipietrum demands peg, which served as a i;nomon to cast a access to a table of chords, but the instrument to is still down face.

But because the Sun is bright, and therefore blindwould pro- ing to the eye, your southerly direction bably not yet be fixed very accurately. You could improve the result by observing some bright star, in the manner shown in Figure 2. 1 . Sit as nearly to the Accuracy of astronomical observation depends largely on the degree of iiMiM refinement of ttie tools employed. That, in turn, depends on technology. Lett: Borneo tribesmen using upright gnomon to measure length of shadow cast by sun near summer solstice.

Position of sight on circle at moment of observation gives declination of star or planet. 11 was sighted in turn the sight S. 10 was so turned that the object appeared equally bright through both. slits in Here a second graduated circle is added. 10. From of this scale it was possible to determine the longitude of the rod two readings of the star or planet. 4' Tropic is r)f Capricorn. Surrf>unding this pnyection a scale for measuring the time in hours. Mounted above the main circular plate is a second plate, called the rele, cut away to form a kind of planisphere, or nvap of the brightest stars.

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The Star Book: An Introduction to Stargazing and the Solar System by Peter Grego


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