Class notes

Observing the Sky

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Course
1100

Institution
Kwantlen Polytechnic University (KPU )

Provides detail information about Earth's cycles and how they work. It includes information about how tides, seasons, day & night and season functions.

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Uploaded on August 8, 2024
Number of pages 7
Written in 2024/2025
Type Class notes
Professor(s) Jana
Contains All classes

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ASTR 1100: History and Observing the Sky

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1. Class notes - History of astronomy
2. Class notes - Observing the sky
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Observing
the Sky

LECTURE 2

, I. BASICS
HORIZON
A flat tangent to the Earth’s
surface where the observer is
standing (line that connects
the sky to the ground/sea). ZENITH
Appears as a straight line in Point on the celestial
human perspective. sphere directly above the
observer’s position on Earth
(point of where you are).
Point over your head.
If looking up into the sky,
the zenith is the point
NADIR
where your line of sight
Opposite of zenith.
intersects with the celestial
Point directly below the
sphere.
observer’s position on Earth
(directly beneath your feet).
Lowest point in the sky.

CELESTIAL SPHERE
Giant, imaginary spherical
dome that surrounds the
Earth.
Rotates as Earth does on its
axis.
A reference point for
measuring and calculating
positions of celestial
objects.

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