PHYSICAL SCIENCE Flashcards
is a concept
that describes the Earth
as the centre of the
universe
Geocentric model
Earth is at the centre of
universe and other
objects revolve around it
Geocentric model
Sun appearing to be
revolving around the
Earth once per day and
an observer for Earth
sees a stationary Earth
Geocentric model
Is an
astronormical rnodel in
Whhich the Earth and
planets rmove around
the Sun at the centre of
the Solar syster-n
Heliocentric Model
Sun Is at the centre Of
the solar systern while
other objects including
the Earth revolve
around the Sun
Heliocentric Model
Telescopic Evidence
Heliocentric Model
stated that the Earth is the center of the universe
Geocentric theory
considered that the sun is the center of the universe.
Heliocentric Model
There were scientists who supported the geocentric model like
Eudoxus, Aristotle, and Ptolemy
believed in Heliocentric theory.
Aristarchus and Copernicus
The ideas about the
spherical Earth were also argued
at around ____________. in
ancient time.
6th Century B.C
One of the Scientists
who supported the idea of a
spherical Earth was ___________.
Aristotle
He also observed that every
a portion of Earth tends toward the
center and form a sphere by
_________________
CONVERGENCE OR
COMPRESSION.
He also explained that the
travelers going south see southern
constellations rise higher above
the horizon and during the __________________, the shadow of Earth on
Moon is ______________
lunar
eclipse, round.
He also observed that the
stars seen in Egypt and Cyprus
were not seen in the northerly
regions and this could only
happen in a _____________
Tycho Brahe, curved surface.
___________
believed that the Earth is
spherical.
Aristotle and the Ancient Greeks
To prove his claim, he
provided physical and
observational arguments about
this. He also observed that every
portion of Earth tends toward the
center and form a sphere by
CONVERGENCE OR
COMPRESSION.
Aristotle
Even before the invention of ___________,
astronomers and ancient people have already
observed different astronomical phenomena
particularly the things happening on the sun,
moon, and the planets.
telescope
The motion of the sun was studied by
the ancient ______________ using a
primitive way of ____________which they called as
GNOMON.
Babylonian and Egyptian, sundial, GNOMON
rising and setting of the ____________in the________________, respectively,
SUN , east and
the west,
point where the Sun rises and sets in the
________________varies in a year,
HORIZON
phases of the _____________,
moon
lunar ______________,
eclipse
_____ eclipse,
solar
daily and annual motion of the _________ , and
7. planets _____________________
stars, Mercury, Venus, Mars, Jupiter, and
Saturn.
In a lunar eclipse, the Moon moves into
the _____________ cast by______________.
shadow of Earth ,the Sun
When the Moon passes through the
the outer part of Earth’s shadow—the
_____________,
penumbra
, where the light of the Sun is
only partly extinguished—the Moon
dims only slightly in what is called a
__________________.
penumbral eclipse
When the Moon
passes through the central part of
Earth’s shadow—the ___________, where the
direct light of the Sun is totally
blocked—the lunar eclipse is considered
partial if the Moon is partly within the
umbra or total if the Moon is
completely within it.
umbra
In a _______________, the Moon passes between
Earth and the Sun and stops some or all of
the Sun’s light from reaching Earth.
solar eclipse
In a _______________, the Sun is partly covered when
the Moon passes in front of it.
partial
solar eclipse
it. In a _____________, the Moon completely covers the Sun.
total solar
eclipse
In an ______________, the Moon does
not completely cover the Sun but leaves the
edge of the Sun showing.
annular solar eclipse
made accurate
measurements and observations of the
position of stars, sun, moon, and the
planets even before the invention of
telescope.
Tycho Brahe
His innovations and extensive
collection of data in observational
astronomy was obtained by his student
___________ when he died.
Tycho Brahe, Johannes Kepler
Using these
observations,_______________ found that
the orbits of the planets followed three
laws.
Johannes Kepler
He formulated the three
laws of planetary motion based on
the data gathered by____________.
Johannes Kepler
Kepler eventually used the data
gathered by Brahe to prove
_________________ and to calculate the
_______.
heliocentrism, orbital laws
Kepler also noticed an
an imaginary line is drawn from a
planet to the sun swept out
equal area of space in equal
time, regardless of the position
of the planet from its orbit. He
explained that the planet
moves faster when it is near
the sun and slower when it is
far from the sun. this
observation led him to
formulate his second law of
planetary motion which he
called ___________
Law Of Equal Areas.
He also observed that the orbits of the planets are ellipse with the sun at one focus
thus formulating his first law of planetary motion, the _________________________
Law Of Ellipses.