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Astronomy |
Record 76 to 100 of 143 |
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Moon Eclipse "When the Moon falls into the shadow of the Earth, the rays of the Sun are intercepted, or hid from her, and she then becomes eclipsed. when the Earth's shadow covers a part of her face, as seen by u... |
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Moon Phases The phases of the moon.... |
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Moon Phases "Let S be the Sun, E the Earth, and A, B, C, D, F, the Moon in different parts of her orbit. Now when the Moon changes, or is in conjunction with the Sun, as at A, her dark side is turned towards the... |
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Neap Tides "The elevation of the tides at c and d is produced by the causes already explained; but their elevation is not so great as normal, since the influence of the Sun acting in the direction a b, tends to ... |
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North Star Finding the north star with the Big Dipper and Cassiopeia.... |
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North Star, Finding "Two stars in the Big Dipper opposite the handle indicate the direction toward the North Star, which, though not very bright, is the first very noticeable star in line." -Wiswell, 1913... |
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Oblate and Prolate Spheroid The shape of the earth is that of a round ball or sphere slightly flattened at two opposite sides. Such a body is termed a spheroid. There are two kinds of spheroids-oblate and prolat... |
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Observatory "The observatory. This view is from the field, looking north. On the left is seen the winding Schuylkill, and the rolling country beyond; and on the right, the distant hills of Montgomery county."&m... |
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Orbits "The orbits of Mars, Earth, Venus, and Mercury." — Encyclopedia Britanica, 1893... |
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Orion Constellation: Orion... |
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Persues Constellation: Persues... |
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Pisces A fish constellation and zodiac sign.... |
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Planet Distance "Relative distance of the Planets. Having now given a short account of each planet composing the solar system, the relative situation of their several orbits, with the exception of those of the Aster... |
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Planet Motion "Circular Motion of the Planets." —Comstock, 1850... |
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Planet Motion "Elliptical Orbits.—It has been supposed that the Sun's attraction, which constitutes the Earth's gravity, was at all times equal, or that the Earth was at an equal distance from the Sun, in all... |
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Planet Rotations "The motion of Saturn, Jupiter, and Mars with respect to Earth." — Encyclopedia Britanica, 1893... |
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Planet Sizes "The comparative dimensions of the planets." —Comstock, 1850... |
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Planets The celestial bodies that revolve around the sun and receive light and heat from it. This diagram shows the comparative sizes of the planets.... |
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Planets A diagram showing the planets of our solar system.... |
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Pole Depression "Two hoops of thin iron are placed upon an axis which passes through their poles. The two ends of each hoop cross each other at right angles, and are fastened together, and to the axis at the bottom.... |
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Positions The flood tides are the highest, and the ebb tides are the lowest. These are called spring tides. They occur twice during every revolution of the moon-once at full, and once at new |
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Rays "Summer and Winter rays.—Let us suppose that the rays falling perpendicularly on a given extent of surface, impart to it a certain degree of heat, then it is obvious, that if the same number of ... |
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Saturn "Saturn is the 6th of the major planets in order of distance from the sun, and the outermost known to the ancients. Its mean diameter is about 70,000 miles, its mean distance from the sun somewhat mor... |
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Saturn One of the major planets, which is siexth in distance from the sun. It is the second planet in size, being exceeded only by Jupiter, and has a mean diameter of 71,000 miles.... |
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Seasons "Suppose the Earth to be in her Summer solstice, which takes place on the 21st of June. At this period she will be at a, having her north pole, n, so inclined towards the Sun, that the whole arctic c... |
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