Axial tilt: Difference between revisions
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[[File:Earth_obliquity_range.svg.png|300px|thumb|right|Figure 1. The Earth's axial tilt, also called obliquity.<ref>By NASA, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3995966</ref> This tilt varies between 22.1° and 24.5° but is currently 23.5°.]] | [[File:Earth_obliquity_range.svg.png|300px|thumb|right|Figure 1. The Earth's axial tilt, also called obliquity.<ref>By NASA, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3995966</ref> This tilt varies between 22.1° and 24.5° but is currently 23.5°.]] | ||
<onlyinclude>'''Axial tilt''', also called obliquity, refers to the angle a planet's rotation axis makes with the plane of its orbit. The Earth is currently tilted 23.5° from this plane, resulting in many remarkable effects.</onlyinclude> The tilt of the Earth can be attributed to the stabilizing effect of the Moon.<ref name=hyp>HyperPhysics. (accessed June 7, 2016). ''Axial Tilt is Critical for Life'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/astro/orbtilt.html</ref> | <onlyinclude>'''Axial tilt''', also called '''obliquity''', refers to the angle a planet's rotation axis makes with the plane of its orbit. The Earth is currently tilted 23.5° from this plane, resulting in many remarkable effects, including the seasons around the planet.</onlyinclude> The tilt of the Earth can be attributed to the stabilizing effect of the Moon.<ref name=hyp>HyperPhysics. (accessed June 7, 2016). ''Axial Tilt is Critical for Life'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/astro/orbtilt.html</ref> Axial tilt contributes to the [[Milankovitch cycle]]s that have changed the Earth's climate in the past. | ||
Axial tilt | |||
==Effects of Earth's tilt== | ==Effects of Earth's tilt== | ||
The tilt of the Earth's rotation axis | The tilt of the Earth's rotation axis is part of what allows an appropriate [[climate]] for Earth to support life. By altering what portions of the Earth get the majority of incoming [[sunlight]], no region on Earth is allowed to [[heat]] to extreme [[temperature]]s.<ref name=hyp/> This can be seen in '''Figure 1'''; throughout Earth's orbit around the [[Sun]] the Northern and Southern Hemispheres alternate which side directly faces the Sun, preventing any region from extreme heating. | ||
===Seasons=== | ===Seasons=== | ||
A common misconception is that seasons are caused by the Earth moving farther or closer away from the Sun.<ref>HyperPhysics. (Accessed June 7, 2016). ''Seasons'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solar/seasons.html#c1</ref> The variation of which hemisphere faces the Sun at a given time, as mentioned above, is in fact what causes seasons on Earth. When the Northern Hemisphere is facing the Sun, seen in '''Figure | A common misconception is that seasons are caused by the Earth moving farther or closer away from the Sun.<ref>HyperPhysics. (Accessed June 7, 2016). ''Seasons'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solar/seasons.html#c1</ref> The variation of which hemisphere faces the Sun at a given time, as mentioned above, is in fact what causes seasons on Earth. When the Northern Hemisphere is facing the Sun, seen in '''Figure 2''', it is Summer there. The first day of summer, or the summer solstice, occurs when the Northern Hemisphere is maximally facing the Sun. This also marks the first day of Winter in the Southern Hemisphere. | ||
Since the Earth's rotation axis remains fixed, when the Earth moves to the opposite side of the Sun it is | Since the Earth's rotation axis remains fixed, when the Earth moves to the opposite side of the Sun, it is Winter in the Northern Hemisphere, and Summer in the Southern Hemisphere, as it is now the Southern Hemisphere that receives the majority of the [[Solar energy to the Earth|Sun's incoming energy]]. | ||
[[File:earthtilt.png|600px|thumb|center|Figure 2. The tilt of the Earth is what causes seasons to occur.<ref name=hyp/>]] | [[File:earthtilt.png|600px|thumb|center|Figure 2. The tilt of the Earth is what causes seasons to occur.<ref name=hyp/> These are the seasons in relation to the Northern Hemisphere.]] | ||
The tilt also produces effects such as the Midnight Sun, where the Sun never sets during some summer nights in very high-latitude regions. | The tilt also produces effects such as the Midnight Sun, where the Sun never sets during some summer nights in very high-[[latitude]] regions. | ||
===Polar ice=== | ===Polar ice=== | ||
The tilt of the Earth results in the poles not receiving as much energy as the equator - at a 23.5° tilt, the poles only get around 40% of the energy the equator gets.<ref name=hyp/> This 23.5° tilt is also not set indefinitely as it changes over long periods of time (around 40,000 | The tilt of the Earth results in the poles not receiving as much energy as the equator - at a 23.5° tilt, the poles only get around 40% of the energy the equator gets.<ref name=hyp/> This 23.5° tilt is also not set indefinitely as it changes over long periods of time (around 40,000 [[year]]s), ranging between 22.1° - 24.5° (a factor in [[natural climate change]]).<ref>NASA. (Accessed June 7, 2016). ''Milutin Milankovitch (1879-1958)'' [Online], Available: http://earthobservatory.nasa.gov/Features/Milankovitch/milankovitch_2.php</ref> Both of these factors allow for [[land vs sea ice#Land Ice|ice]] to build up year-after-year in high latitudes, eventually creating massive [[glacier|ice sheets]]. This ice has drastic effects on the Earth's [[climate system]] due to its high [[albedo]], among other things. | ||
==For Further Reading== | |||
*[[Hydrologic cycle]] | |||
*[[Climate]] | |||
*[[Energy]] | |||
*[[Solar energy to the Earth]] | |||
*[[Glacier]] | |||
*Or explore a [[Special:Random|random page]] | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
[[Category: Uploaded]] | |||
Latest revision as of 15:32, 28 April 2020
Axial tilt, also called obliquity, refers to the angle a planet's rotation axis makes with the plane of its orbit. The Earth is currently tilted 23.5° from this plane, resulting in many remarkable effects, including the seasons around the planet. The tilt of the Earth can be attributed to the stabilizing effect of the Moon.[2] Axial tilt contributes to the Milankovitch cycles that have changed the Earth's climate in the past.
Effects of Earth's tilt
The tilt of the Earth's rotation axis is part of what allows an appropriate climate for Earth to support life. By altering what portions of the Earth get the majority of incoming sunlight, no region on Earth is allowed to heat to extreme temperatures.[2] This can be seen in Figure 1; throughout Earth's orbit around the Sun the Northern and Southern Hemispheres alternate which side directly faces the Sun, preventing any region from extreme heating.
Seasons
A common misconception is that seasons are caused by the Earth moving farther or closer away from the Sun.[3] The variation of which hemisphere faces the Sun at a given time, as mentioned above, is in fact what causes seasons on Earth. When the Northern Hemisphere is facing the Sun, seen in Figure 2, it is Summer there. The first day of summer, or the summer solstice, occurs when the Northern Hemisphere is maximally facing the Sun. This also marks the first day of Winter in the Southern Hemisphere.
Since the Earth's rotation axis remains fixed, when the Earth moves to the opposite side of the Sun, it is Winter in the Northern Hemisphere, and Summer in the Southern Hemisphere, as it is now the Southern Hemisphere that receives the majority of the Sun's incoming energy.
The tilt also produces effects such as the Midnight Sun, where the Sun never sets during some summer nights in very high-latitude regions.
Polar ice
The tilt of the Earth results in the poles not receiving as much energy as the equator - at a 23.5° tilt, the poles only get around 40% of the energy the equator gets.[2] This 23.5° tilt is also not set indefinitely as it changes over long periods of time (around 40,000 years), ranging between 22.1° - 24.5° (a factor in natural climate change).[4] Both of these factors allow for ice to build up year-after-year in high latitudes, eventually creating massive ice sheets. This ice has drastic effects on the Earth's climate system due to its high albedo, among other things.
For Further Reading
- Hydrologic cycle
- Climate
- Energy
- Solar energy to the Earth
- Glacier
- Or explore a random page
References
- ↑ By NASA, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3995966
- ↑ 2.0 2.1 2.2 2.3 HyperPhysics. (accessed June 7, 2016). Axial Tilt is Critical for Life [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/astro/orbtilt.html
- ↑ HyperPhysics. (Accessed June 7, 2016). Seasons [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/solar/seasons.html#c1
- ↑ NASA. (Accessed June 7, 2016). Milutin Milankovitch (1879-1958) [Online], Available: http://earthobservatory.nasa.gov/Features/Milankovitch/milankovitch_2.php