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16 Earth in
16

Space

Earth as seen from space. Do you see the United States, with a storm
over the East Coast? Do you see Denver and Los Angeles? One topic of this
chapter is identifying places on Earth, which should help you find places
in the United States.

CORE CONCEPT

The way Earth moves in space is used to define time and describe location
on the surface, and causes recurrent phenomena such as seasons.

OUTLINE

16.1 Shape and Size of Earth
Revolution 16.2 Motions of Earth
Earth moves around the Sun in Revolution Rotation
a yearly revolution with the same Rotation Earth spins on its axis in a daily
Precession
orientation of its axis relative to
16.3 Place and Time rotation.
the background of stars.
Identifying Place
Measuring Time
Daily Time Measuring Time
Identifying Place Science and Society: Saving Time? Recurring cycles associated with
Earth’s axis and equator serve as Yearly Time the rotation of Earth on its axis
Monthly Time
references for finding locations 16.4 The Moon and its revolution around the
on the surface with parallels and Composition and Features Sun are used to define measures
meridians. History of the Moon of time.
16.5 The Earth-Moon System
Phases of the Moon
Phases of the Moon Eclipses of the Sun and Moon Tides
Tides
The Moon phases are caused People Behind the Science: A tide is the periodic rise
by the relative positions of the Carl Edward Sagan and fall of sea level, and the
Earth, Moon, and Sun and by timing and size of a given tide
our viewing different parts of the are influenced by the relative
Moon that are in sunlight and positions of Earth, Moon, and
not in sunlight. Sun; the orbit of the Moon; and
the size, shape, and depth of the
basin holding the water.

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