Astronomers;Ancient n Modern

Eratosthenes

Greek mathematician astronomer and geographer. Use the sun to measure the size of the round earth.

Claudius ptolemy

Ancient greek astronomer. Made a model of the solar system called “ptolemaic system or earth centered”. Discover the movements of the stars and planets, planets orbited in smaller orbit called “epicycle” revolving along large circles called “deferent”.

What did Ptolemy make

“Ptolemaic system or earth centered”

Epicycle

Planets orbited in smaller orbits

Deferent

Epicycles revolve around them , the large circles

Azophi abdal-Rahman al-sufi

Persian astronomer. First observation of group of stars outside milky way or andromeda galaxy that they might collide.

Another term of the milky way

Andromeda galaxy

Hipparchus

First person to make first star catalog that divided the stars into 48 constellations/patterns the foundation of modern constellations . Now we have 88 constellations.

How many constellations did we have in the past

48 constellations or patterns

How many constellations do we have now

88 constellations or patterns

Aristarchus of samos

Greek astronomer. Earth rotates on its axis and revolves around the sun. First to propose the heliocentric model of the solar system. Was rejected.

Aristotle

Develop system predict the motion of stars. Astronomical work “almagest”. Supported the ptolemaic model of the solar system

Nicolaus copernicus

Polis astronomer. Propose copernican model or heliocentric model of solar system. Accepted.

What is almagest

The astronomical work of aristotle that predicts the motion of stars

Galileo galilei

Italian. First use telescope to discover: galilean moons, rings of saturn ,phases of venus, sunspots, surface of moon. Accepted copernican model.

Isaac newton

Formulated universal law of gravitation and law of gravity. Improved reflective telescope using concave mirrors instead of lenses.

Albert einstein

Formulated special relativity, general theory of relativity, speed of light

Johannes kepler

Formulated three laws of planetary motion from his teacher: elliptical orbits, equal area law, harmonic law.

Rudolphine table: accurate astronomical tables predicting planetary motions

Three laws of planetary motion

Elliptical orbits, equal area law ,harmonic law

Rudolphine table

Accurate astronomical tables predicting planetary motions

Tycho Brane

Teacher of kepler, discovered “tycho's supernova”. Precise astronomical observations: naked eye observations planetary motions.

Stephen hawking

Exploding black holes, relativity theory and quantum mechanics, works on space time singularities

Vera rubin

Dark matter discovery. Her calculation showed galaxies must contain about 10 times as much ‘dark’ mass as can accounted visible by stars. Advocate for women in science

Brian Schmidt

Forming, leading “high z supernova search team”. Accelerating expansion of universe or “open universe”.

Another word for accelerating expansion of universe

Open universe

Neil de grase tyson

Research about star formation, exploding stars, dwarf galaxies and structure of milky way

Amy mainzer

Infrared astronomy of space telescopes-works on NEOWISE discovering asteroids and comets. Contributed to infrared instrumentation on james webb space telescopes (JWST).

How many ancient astronomers are there

6

How many modern astronomers

6

How many 21st century

5

Can u do it?

Yes