Properties of
the sun
1. The sun is the centre of mass in the
solar system.
2. The sun is the centre of gravity in
the solar system.
3. The sun has a linear diameter of
1.39×106 km
4. The sun has an angular velocity of about
3.2×106 km from east to south.
5. The surface area of the sun is
6.09×1012km2
6. The sun has a mass of 1.99×1030kg
7. The sun has a volume of 1.41×1027km3
8. It has a mean density of 1400kg/m3
9. It has a surface temperature of about
5538°C.
10.
The
temperature at the center is about 1.67×107°C.
11.
It
as a parabolic velocity at the surface of about 617 kilometer per hour.
12.
The
escape velocity at the surface is 11200m/s
13.
Rotational
velocity equatorial perspectives 465 m/s
14.
Mean
velocity 29.78km/s.
15.
The
period of revolution of sun around its galaxy is about 250 million years.
16.
A light year is a distance travelled by light
in a year which is about 10, 000 billion kilometers.
17.
The
sun has a radius of about 696, 000 km
18.
Sun
has a surface gravity of 274 m/s2
19.
The distance between the sun and the earth is
about 150 million kilometers.
20.
The
elemental composition hydrogen 74%, helium 25 % and others1% by mass.
21.
The
age of the sun is about4.5 billion years
22.
The
brightness of the sun is about 4.0×1033erg/s.
23.
The
sun is completely gaseous; there is no solid surface on the sun.
24.
Solar
cycle repeats after a period of 11 years.
25.
The
sun has about 99.8% of the total mass of the solar system.
26.
The
sun generates its energy by nuclear fusion reaction.
27.
Its orbit from the center of its galaxy is
about 25, 000 light years.
28.
The
sun belongs to the generation of stars called population 1.
29.
The
sun is at its closest distance to the earth of about 0.983 AU on about 3rd
of January of every year.
30.
AU
is the astronomical unit equal 150 million kilometers.
31.
The
farthest distance from the earth of about 1.017AU on about 4th of
July of every year.
32.
The
sun is at its average distance on the 5th of October and 4th
of April.
33.
The
maximum solar declination in a day is 0.5°
34.
Insolation
or solar constant is the intensity of direct solar radiation incident on a
horizontal surface per unit area per unit time.
35.
Sun
has an equatorial circumference of 4.379×106 kilometer.
36.
It
is 109 times larger than the earth and 330, 000 time massive than the earth.
37.
The
sun is so hot that no single solid or liquid can stay on it.
38.
All
planetary and interplanetary gravitational phenomena are negligible compared to
that brought by the mass of the sun.
39.
The
sun is the primary source of energy on the earth.
40.
Almost
75% of the sun mass is gaseous hydrogen.
41.
The
sun has enough fuel (hydrogen ) to survive another 4 billion years
42.
The
sun is brighter than 85% of the stars in the Milky Way.
43.
The
sun is 13 billion times brighter than the next brightest star.
44.
The
sun does not have an outer boundary, it density decrease exponentially as its distance
decreases from the centre.
45.
It
takes 8 minutes 19 seconds for light from the sun horizon to reach the earth
horizon.
46.
The
sun rotates faster at its equator than at its poles.
47.
The
sun is white in color, the yellow, red and magenta are due to the scattering of
the sun ray by the atmosphere.
48.
Perihelion
the closest distance of the sun from the earth which is 0.983AU.
49.
Aphelion
is the farthest distance of the sun from the earth which is 1.017AU.
50.
Solstice
means unequal day and night, it occur when the solar declination angle is +23.5°
or -23.5°.
51.
Equinox
means equal day and night, it occurs when solar declination angle is zero.
No comments:
Post a Comment