The horizon is the line that separates
the Earth from the sky. Some of the
best places to see the unobstructed horizon are beaches, where the ocean
meets the sky in an uninterrupted line. Here,
Venus and the Moon rise together over the Atlantic Ocean horizon on the coast of
Jacksonville, Florida.
the Earth from the sky. Some of the
best places to see the unobstructed horizon are beaches, where the ocean
meets the sky in an uninterrupted line. Here,
Venus and the Moon rise together over the Atlantic Ocean horizon on the coast of
Jacksonville, Florida.
The Horizon Line is
the place where the ground and the sky appear to meet.It is also your eye
level.
the place where the ground and the sky appear to meet.It is also your eye
level.
There two main types of
horizons—Earth–sky horizons
and celestial horizons. Both Earth–sky and
celestial horizons have different sub-types of horizons.
horizons—Earth–sky horizons
and celestial horizons. Both Earth–sky and
celestial horizons have different sub-types of horizons.
The local horizon,
geographic horizon,
and sea-level horizonare
all Earth–sky horizons.
The astronomical horizon and
true horizon are
celestial horizons.
geographic horizon,
and sea-level horizonare
all Earth–sky horizons.
The astronomical horizon and
true horizon are
celestial horizons.
The local horizon,
also called the geometrical horizon,
is the visible boundary between the Earth and sky.
The localhorizon may
include trees, buildings, and mountains.
also called the geometrical horizon,
is the visible boundary between the Earth and sky.
The localhorizon may
include trees, buildings, and mountains.
The geographic
horizon is the apparent boundary between the Earth and sky.
Mountains, trees, and other elevated features are not considered part of
the geographic horizon.
horizon is the apparent boundary between the Earth and sky.
Mountains, trees, and other elevated features are not considered part of
the geographic horizon.
The sea-level
horizon is the geographic horizon at sea
level. One of the best places to see the sea-level horizon is
abeach. The ocean and the sky provide
a clean, flat line where the Earth seems
to meet the sky. If
you’re standing on the beach looking out at the sea, the part of the sea that
“touches” the horizon is
called the offing.
horizon is the geographic horizon at sea
level. One of the best places to see the sea-level horizon is
abeach. The ocean and the sky provide
a clean, flat line where the Earth seems
to meet the sky. If
you’re standing on the beach looking out at the sea, the part of the sea that
“touches” the horizon is
called the offing.
Celestial Horizons
Celestial horizons are
used by astronomers. They aremeasurements of the position of the Earth relative
to the rest of the sky.
used by astronomers. They aremeasurements of the position of the Earth relative
to the rest of the sky.
The astronomical
horizon is the imaginary horizontal planealways at a 90-degree
angle from the observer’s zenith (the point directly above the
observer). Astronomical horizons are great circles that surround the
observer.
horizon is the imaginary horizontal planealways at a 90-degree
angle from the observer’s zenith (the point directly above the
observer). Astronomical horizons are great circles that surround the
observer.
The true horizon is
the imaginary plane that passes through the center of the Earth, perpendicular to
its radius. From orbit, the true horizon is spherical,
following the shape of the Earth.
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