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By Neil F. Comins

Learning the Universe is the bestselling short textual content for descriptive one-term astronomy classes (especially people with no arithmetic prerequisites). Carried alongside by means of the book's bright major subject, "the means of medical discovery," the 8th version furthers the book’s legacy for proposing thoughts essentially and thoroughly whereas delivering the entire pedagogical instruments to make the training method memorable.

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Soon after dark, find a spot away from bright lights, and note the constellations in the sky relative to some prominent landmarks near you on Earth. A few hours later, check again from the same place. You will find that the entire pattern of stars (as well as the Moon, if it is visible) has shifted. New constellations will have risen above the eastern horizon, while other constellations will have disappeared below the western horizon. If you check again just before dawn, you will find the stars that were just rising in the east when the night began are now low in the western sky.

Three months after the vernal equinox, around June 21, the Sun rises farthest north of east and passes highest in the sky (Figure 1-17c). This is the summer solstice (see Figure 1-16), the day of the year in the northern hemisphere with the most daylight. From June 21 through December 21, the Sun rises farther south than it did the preceding day. Its highest point in the sky is lower each succeeding day—the cycle of the previous six months reverses. The autumnal equinox occurs around September 22 (Figure 1-17d), with the Sun heading southward across the celestial equator, as seen from the Earth.

Take a friend outside on a clear, warm night to observe the diurnal motion of the stars for yourselves. Soon after dark, find a spot away from bright lights, and note the constellations in the sky relative to some prominent landmarks near you on Earth. A few hours later, check again from the same place. You will find that the entire pattern of stars (as well as the Moon, if it is visible) has shifted. New constellations will have risen above the eastern horizon, while other constellations will have disappeared below the western horizon.

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