Bookmarks
Concepts
Activity
Courses
Learning Plans
Courses
Request
Log In
Sign up
👤
Log In
Join
?
⚙️
→
👤
Log In
Join
?
←
Menu
Bookmarks
Concepts
Activity
Courses
Learning Plans
Courses
Request
Log In
Sign up
×
CUSTOMIZE YOUR LEARNING
→
TIME COMMITMENT
10 sec
2 min
5 min
15 min
1 hr
3 hours
8 hours
1k hrs
YOUR LEVEL
beginner
some_idea
confident
expert
LET'S Start Learning
👤
Log In
Join
?
⚙️
→
👤
Log In
Join
?
←
Menu
Bookmarks
Concepts
Activity
Courses
Learning Plans
Courses
Request
Log In
Sign up
×
CUSTOMIZE YOUR LEARNING
→
TIME COMMITMENT
10 sec
2 min
5 min
15 min
1 hr
3 hours
8 hours
1k hrs
YOUR LEVEL
beginner
some_idea
confident
expert
LET'S Start Learning
New Course
Concept
Critical Reflection
Critical reflection
is the process of analyzing, reconsidering, and
questioning experiences
within a broad context of issues, such as ethical, social, and
political implications
. It involves a
deep examination
of assumptions, beliefs, and values, leading to
transformative learning
and
personal growth
.
Relevant Degrees
Philosophy’s Purpose and Role 40%
Theory of Knowledge 30%
Education Systems 20%
Sociology 10%
Generate Assignment Link
Lessons
Concepts
Suggested Topics
Foundational Courses
Learning Plan
All
Followed
Recommended
Assigned
Concept
Geocentric Model
The
geocentric model
is an
ancient astronomical theory
that places
Earth at the center of the universe
, with all other
celestial bodies orbiting around it
. This model was widely accepted until the 16th century when the
heliocentric model
, which positions the
Sun at the center
, began to gain prominence due to the
work of astronomers
like Copernicus and Galileo.
Concept
Ptolemaic System
The
Ptolemaic System
is an ancient
geocentric model of the universe
that places
Earth at the center
, with
celestial bodies
moving in
complex paths
known as epicycles. This model, developed by
Claudius Ptolemy
in the
2nd century AD
, dominated
astronomical thought
until the
Copernican Revolution
in the
16th century
, which introduced a
heliocentric model
.
Concept
Planetary Motion
Planetary motion
refers to the
gravitationally determined paths
taken by planets as they orbit around a star, primarily described by Kepler's laws of
Planetary motion
. These laws explain the
elliptical orbits
, the
equal area law
, and the
harmonic law
, providing a foundation for understanding
celestial mechanics
and the
dynamics of our solar system
.
Concept
Astronomy
Astronomy is the
scientific study of celestial objects
, space, and
the universe
as a whole, aiming to understand their origins, evolution, and
fundamental processes
. It combines
observational techniques
with
theoretical modeling
to
explore phenomena
ranging from planets and stars to galaxies and
cosmic microwave background radiation
.
Concept
Celestial Mechanics
Celestial mechanics
is the
branch of astronomy
that deals with the motions and
gravitational interactions of celestial bodies
. It provides the
mathematical framework
for predicting the positions and
movements of planets
, moons, and other
astronomical objects in space
.
Concept
Epicycle
Concept
Deferent
The deferent is a key concept in the
Ptolemaic model of the universe
, representing a
large circle around the Earth
along which the
center of a smaller circle
, the epicycle, moves. This model was used to explain the
apparent retrograde motion of planets
, with the deferent and epicycle together accounting for the
observed movements of celestial bodies
in the sky.
Concept
Eccentricity
Eccentricity measures
how much a
conic section
(such as an ellipse, parabola, or hyperbola) deviates from being circular, with values ranging from 0 (a
perfect circle
) to greater than 1 (a hyperbola). In orbital mechanics, it describes the
shape of an orbit
, influencing the
distance variations
between the
orbiting body
and the
focal point
, typically a star or planet.
Concept
Uniform Circular Motion
Uniform circular motion
refers to the
motion of an object
traveling in a
circular path
at a
constant speed
. Although the speed remains constant, the
direction of the velocity vector
changes continuously, resulting in a
centripetal acceleration
directed towards the
center of the circle
.
Concept
Ptolemaic Astronomy
Ptolemaic Astronomy
, developed by
Claudius Ptolemy
in the
2nd century AD
, is a
geocentric model of the universe
that posits the
Earth as the stationary center
around which the sun, moon, planets, and stars revolve. This model, characterized by its use of epicycles to explain the
retrograde motion of planets
, dominated
astronomical thought
in the
Western world
for over a millennium until the
Copernican Revolution
.
Concept
Ptolemy's Almagest
Ptolemy's Almagest
is a
seminal astronomical treatise
that laid the groundwork for the
geocentric model of the universe
, asserting that the Earth is at the center of the cosmos with
celestial bodies orbiting
around it. This work,
compiled in the 2nd century AD
, synthesized
Greek astronomical knowledge
and introduced
mathematical models to predict planetary positions
, influencing astronomical thought for
over a millennium
.
Concept
Celestial Spheres
The concept of
Celestial Spheres
represents an
ancient model of the universe
where the Earth is at the center, surrounded by
concentric spheres
that carry
the planets
, the Sun,
the Moon
, and
the stars
. This model, pivotal in the
development of astronomy
, was widely accepted until the
heliocentric model
proposed by Copernicus in the
16th century
.
3