By Jean Meeus
Mathematical Astronomy Morsels. Jean Meeus's explores the frequency of blue moons, planetary groupings, and greatly extra, as in basic terms this grasp of astronomical calculations might. the following, he has introduced jointly the simplest from his voluminous writings, spanning approximately part a century, on each kind of celestial configuration, cycle, and interest.
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Extra resources for Mathematical Astronomy Morsels
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.