The apparent motion of the Sun always occurs. When the Sun makes apparent motion, the Earth will be affected. These astronomical events even occur periodically.
The sun as the center of the Solar System has various space objects orbiting it. Planet Earth is one that orbits the Sun throughout the year.
Because of this, the sun’s activity will definitely have a big impact on the Earth, including the motion of everything that the star does. The apparent annual motion of the giant star makes it appear to move up north and down south all year round.
This movement occurs due to the Earth’s revolution, namely the movement of the planets around the Sun within one year.
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What is the apparent motion of the sun?
The phenomenon of apparent motion in the main stars of the Solar System has actually occurred frequently. This movement makes the Sun appear as if it is moving.
Meanwhile, as the center of the Solar System, the Sun never moves. Instead, it is the planets around it that move, including Planet Earth to go around the Sun.
However, the movement of the Earth can cause the Sun to appear to be moving. This is then known as the apparent motion.
There are actually two things that cause this apparent motion, namely the Earth’s revolution and also the Earth’s rotation. Both cause a different kind of apparent motion. What are you curious about? Listen here!
Daily Pseudo Movement
The first type of apparent motion of the Sun occurs due to the rotation of the Earth. Because it is inside Planet Earth, we will see the Sun as if it is moving from east to west every day.
In fact, the reality is not like that. The earth rotates from west to east every day. So, why is it called daily apparent motion?
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This happens because we as observers can witness the movement of the sun every day which seems to rise in the east and then sets in the west.
This apparent daily movement is the cause of day and night on Earth. The part of the Earth that is exposed to the sun will experience day, while the other side will experience night.
An example of the time difference between countries is in Jakarta at 08.00 WIB, while the people of Seoul already show the time at 10.00 WIB.
Annual Pseudo Motion
In addition to the daily apparent motion of the Sun, there is also an annual apparent motion. This phenomenon occurs because of the revolution of the Earth or the movement of the Earth as it revolves around the Sun.
Earth as a planet of the Solar System will move around the Sun within one year. This then causes it to appear as if the position changes, namely from north to south of Earth.
The result of this is that the position of the Sun is rarely directly above the equator. This will only happen in September, when the sun seems to be moving towards the south.
Meanwhile, October will make the Sun appear to be south of the Equator. The widespread solar radiation causes the air temperature in several regions of the Earth to warm up, including one of Indonesia.
What Causes the Sun’s Apparent Movement?
The apparent motion of the Sun, both daily and yearly, will affect life on Earth. The impact that is felt is the difference in seasons.
Seasons in the northern hemisphere will be different from the southern. This difference is due to the different levels of sunlight as well.
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Sometimes the Sun will illuminate the southern part of the Earth. Some countries have four seasons with different times.
In addition to seasonal differences, this apparent motion can cause monsoon winds that bring heavy rains or very dry winds. This is due to the difference in temperature in the northern and southern parts of the Earth.
Monsoon winds are formed from differences in temperature and move from Africa, India, to Southeast Asia. The presence of monsoon winds can also affect the climate in an area it passes through. That is why the African region is drier than humid Southeast Asia.
The last thing that becomes the impact of apparent motion is the occurrence of the solstice phenomenon, which is when the Sun is in the northernmost or southernmost position for every annual apparent movement and then returns to the Equator.
The apparent motion of the Sun greatly affects the situation on Earth. You need to understand again that the Sun does not move, but the Earth’s rotation and revolution causes this phenomenon. (R10/HR-Online)
This post was last modified on Februari 16, 2023 9:55 PM
