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The Sun has a period around the galactic center (which is normally taken to be Sgr A*) of T~2.5 x 10^8 years = 250 Myr, meaning it will complete a turn around the galaxy in that time.
The angular speed of the Sun around the gal. center will then be w = 2*pi/T = .025 rad/Myr.
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What are some of Copernicus' discoveries and contributions?
he discovered that the earth revolved around the sun (heliocentricity) and at that time everyone believed that the sun/planets revolved around the earth (geocentricity)
What did Copernicus believe about the earth and the sun?
He believed in a heliocentric universe, or a universe where all of the planets revolve around the sun.
What is heliocentrism?
In Heliocentrism, the Sun (Helios) is said to be at the centre of the universe.
What was Copernicus' new concept of the universe?
That Earth went around the sun.
What is a real life example of a rotation?
Earth going around the sun.
Do planets revolve around the sun at the same speed?
A planet has an elliptical shaped orbit. It orbits with a constant angular speed, but a varying linear speed.
How do the moons stay in orbit around the sun?
The moons are around planets, planets are around the sun. But basically the orbit is a mix of forward momentum and the the pull towards the sun, this creats an angular movement. when the planet moves forward, this angular movement is now forward momentum and gravity is still pulling it towards the sun creating a angular movement and when added together this is roughly a circle that goes all around the sun.
What is Sgr A?
Perhaps you mean Sgr A*, or Sagittarius A* (written with an asterisk at the end), an object believed to be a supermassive black hole, in the center of your Milky Way. It is estimated that this black hole has 4 million times the mass of our Sun.
The earths angular momentum when it is nearest to the sun is greater then when it is farthest from the sun?
The earths angular momentum would be the same.
What makes the planets to move around the sun?
The planets orbit the Sun because of gravity and their angular momentum, which ultimately derives from the energy of the Big Bang.
Can a body in translatory motion have angular momentum?
Yes. A nice example is a planet in orbit around the sun. Even if it were not rotating, it would have angular momentum on account of its curved, closed path.
What could Kepler's second law be used to measure?
Kepler's second law says that the line joining a planet to the Sun sweeps out equal areas in equal time. Kepler noticed that when a planet's orbit takes it slightly further from the Sun, it moves more slowly. He deduced from calculations made from observations that when the distance increases by 1%, the angular speed decreases by 1%, so the distance times the angular speed, which is the area swept out per second, stays constant. He found this is true all the time for all the planets, a very important discovery in the history of science. The planet's mass times the distance times the angular speed is the angular momentum, and this stays constant. So angular momentum is 'conserved' as the planet goes round, speeding up and slowing down in its orbit. Therefore the second law is now known as a statement of an important physical principle called the Conservation of Angular Momentum. In this way Kepler's second law contributed to scientific progress after his death. Angular speed is measured in radians per second, and the angular momentum is mass times distance times angular speed. For a single particle it is equal to the linear momentum of the particle (mass times speed), while for a rigid body it is the angular speed times the moment of inertia.
What is Earth's angular momentum when it is at perihelion in its orbit?
The point at which Earth is closest to the the Sun is called perihelion. Even though Earth is close to the Sun then, the Northern hemisphere experiences winter then. This is because the Northern Hemisphere is tilted away from the Sun at perihelion.
What relation in astronomy between the Sun and Earth on July-4?
Aphelion. the Earth and Sun are furthest apart and the Earths angular velocity around the Sun is at its Tlowest (travelling slowly in its orbit).
What is the speed of Mercury around the Sun?
It takes 87.97 earth days to orbit around the sun.
Does earth speed around sun vary?
no
What is the angular size of the Sun and the Moon in order for solar eclipses to occur?
* For a solar eclipse, there is no specific requirement about the angular sizes.* For a TOTAL solar eclipse, the angular diameter of the Moon must be larger than that of the Sun.
