DEFINITION AND CONSEQUENCES REVOLUTION EARTH
Earth is the
circulation of the earth's revolution around the sun. Earth in its orbit around
the sun once within 365¼. Time of the day 365¼ or a solar year is called when the
revolution of the earth.
It turns out the
Earth's axis is not perpendicular to the plane of the ecliptic but slanted in
the same direction forming an angle of 23.50 against the sun, this angle is
measured from an imaginary line connecting the north pole and the south pole is
called the axis of rotation.
This revolution
raises some natural phenomena that take place repeatedly each year among the
old difference of day and night, the annual apparent motion of the sun, the
seasons change, and change the appearance of constellations, as well as calendar
BC.
EFFECT OF REVOLUTION
EARTH
Revolution of the
earth gives some influence, namely:
1. Differences long
day and night
The combination of
the revolution of the earth and the earth's axial tilt to the ecliptic plane
raises some natural phenomenon observed repeated annually. These events appear
to clearly observed around the north pole and a south pole.
The shift orbit the
sun will cause changes / differences in the length of day and night. At certain
moments in one place will have a longer night than during the other and vice
versa when the daylight longer than night. Northern polar night can last for 24
hours on the contrary at the same time at the south pole daylight lasts for 24
hours and vice versa.
Between March 21 s.d
23 September
1. North pole toward the sun, while the south pole away from the sun
2. The northern hemisphere receives more sunlight than the Southern
Hemisphere.
3. Northern hemisphere during the length longer than the southern
hemisphere
4. There is an area around the North Pole
who suffered during 24 hours and there is the area around the south pole
experiencing 24-hour night.
5. Observed from the equator, the sun appears to shift to the north.
6. North pole closest to the sun on June 21.
At this time the observer at the equator 23,5o see the sun shifts to the north.
Between September 23
s.d March 21
1. The south pole is closer toward the sun, while the north pole is
away from the sun.
2. The southern hemisphere receives more sunlight than the northern
hemisphere.
3. The southern hemisphere during the length longer than the northern
hemisphere
4. There are areas around the north pole
experiencing 24-hour night and there was an area around the south pole during
the 24-hour experience.
5. Observed from the equator, the sun appears to shift to the south.
6. South pole is in a position closest to
the sun on 22 December. At this time the observer at the equator 23,5o see the
sun shifts to the south.
On March 21 and
December 23
1. The north pole and the south pole is equal to the sun
2. The northern hemisphere and the southern hemisphere receives
sunlight as much.
3. The same length of day and night throughout the hemisphere.
4. The sun appear on the equator passes directly overhead.
2. Annual Apparent
motion of the Sun
Shifting the
position of the sun towards northern hemisphere (December 22 to June 21) and
shift the position of the sun from the northern hemisphere to the southern
hemisphere (June 21 to December 21) called daily apparent motion of the sun. So
called because the sun does not actually move. The motion was due to the
revolution of the earth with a sloping axis of rotation.
3. Change of Season
The season is one of
the major divisions of the year. Season is the result of the earth's annual
revolution around the Sun and the tilt the Earth's axis relative to the plane
of the revolution. In temperate and polar regions, seasons are marked by
changes in the intensity of sunlight that reaches the earth's surface, variations
of which can cause animals to go into hibernation or migration, and the plants
will be active.
Usually a year is
divided into four seasons, namely:
Spring (vernal)
is one of the four
seasons nontropical areas, the transition from winter to summer. Across the
north earth, estimated spring occurred on March 21-June 21 and dibelahan
southern hemisphere, spring is estimated to take place on September 23 to
December 21.
Summer (festival)
is one season in
temperate countries. Depending on the location of a country, the summer can
occur at different times. In the northern hemisphere, summer is estimated to
take place on 21 June to 23 September and in the southern hemisphere, summer is
estimated to take place on 21 December-March 21. Many countries, summer is the
summer school holidays. At this season people like to go to the beach for
sunbathing. In addition, summer fruits and herbs were in full growth period.
Autumn
is one of the four
seasons in temperate regions, the transition from summer to cold. in temperate zones, autumn is the season
where most plants are harvested or ditunai and deciduous trees release their
leaves. He is also the season in which the days grow short and cold, and
increased precipitation in some parts of the world.In the northern hemisphere,
autumn begins approximately on 23 September- December 21, while in the southern
hemisphere autumn begins around on 21 March-June 21.
Winter
is the coldest
season of the earth. Is one of the four seasons in the countries subtropical
and temperate climates. In the northern hemisphere, winter begins around on 21
December-21 March, while in the southern hemisphere winter begins approximately
on 21 June to September 23.
In Indonesia, a
tropical area in Indonesia and therefore there are only two seasons namely dry
season and rainy season.
Dry season
is the season in the
tropics influenced by the monsoon system. The dry season is known as the dry
season. To be called the dry season, rainfall per month must be below 60 mm /
month (or 20 mm per dasarian) for three consecutive dasarian. Besides Indonesia
countries that often have this season is the tropical areas of Southeast Asia
and South Asia, Australia northeastern Africa, and parts of South America.
Rainy season
is a season
characterized by increased rainfall in some regions than usual within a certain
period regularly. The rainy season is only known in a tropical climate region.
The rainy season is considered to begin when rainfall occurs in three
consecutive dasarian has exceeded 100 mm / m2 per dasarian and continue.
Transition season
is the transition
between the two main seasons in the monsoon climate area, which is between the
rainy season and the dry season. The usual transition period characterized by a
high frequency of storms, torrential rains accompanied by thunder, and wind
blowing loudly. In the transition period is usually people who suffer from
upper respiratory tract, such as colds or coughs, the relative increase. This
period was also marked by a lot of the typical behavior of some animals and
plants.
4. Changes in
appearance of star constellations
The constellation is
the arrangement of the stars visible from earth to form certain patterns. The
stars forming a constellation are not actually at a nearby location. Due to the
location of the stars are very far away, then when observed from the earth as
if it looks close. The constellation we know, among others, Aquarius, Pisces,
Gemini, Scorpio, Leo, and others.
We who are in the
earth can only see stars at night. When the earth is on the east side of the
sun, we can only see stars that are in the east of the sun. When the Earth is
in the north the sun, we can only see stars that are in the north the sun. Due
to the revolution of the earth, the stars are visible from Earth is always
changing. Means the constellations visible from Earth are also changing.
5. Calendar AD
Based on the
distribution of the longitude, the latitude and longitude east, the
international dateline is the longitude 180o, consequently when in the east
longitude 180 ° 15 then in western longitude 180o still the 14th, as if to jump
one day.
BC Count calendar is
based on the time of the revolution of the earth, where one year is equal to
365 ¼ days. Calendar BC were originally used is the calendar of Julius Caesar
or the Julian calendar. Julian calendar is based on the time interval between
the spring with the next spring in the northern hemisphere. The exact time
interval is 365.242 days or 365 days 5 hours 48 minutes 46 second.
