Concepts in Astronomy #16. Axial Tilt by marcusantoniu26

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Concepts in Astronomy #16. Axial Tilt
![galaxy-11139_1920.jpg](https://cdn.steemitimages.com/DQmP7XH1c7DSToHWvRExTRyCiiF9MNAPwhNjjWgDnDnLbzK/galaxy-11139_1920.jpg)

## Axial Tilt

The axial tilt or obliquity is the angle between the orbital plane and the equatorial plane of a planet. It can also be described as the angle between the rotational axis and a perpendicular line to the orbital plane. The Earth's axial tilt is currently 23.44°.  This angle varies between 22.1° and 24.5° in a period that lasts 41000 years.

The axial tilt is responsible for the existence of seasons because it allows one hemisphere to receive more sunlight than the other hemisphere for a determined amount of time in a year (orbital period).


![AxialTiltObliquity.png](https://cdn.steemitimages.com/DQmbeuzL3oWSVaBZcNVsckpnmJ5g8W15j3iC8dPqyKipN9k/AxialTiltObliquity.png)

**Previous Posts**


[Concepts in Astronomy #1. Introduction](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-1-introduction)
[Concepts in Astronomy #2. The Ecliptic](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-2-the-ecliptic)
[Concepts in Astronomy #3. The Celestial Equator](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-3-the-celestial-equator)
[Concepts in Astronomy #4. Right Ascension](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-4-right-ascension)
[Concepts in Astronomy #5. Declination](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-5-declination)
[Concepts in Astronomy #6. The Celestial Sphere](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-6-the-celestial-sphere)
[Concepts in Astronomy #7. Azimuth](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-7-azimuth)
[Concepts in Astronomy #8. Altitude](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-8-altitude)
[Concepts in Astronomy #9. The Equatorial Coordinate System](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-9-the-equatorial-coordinate-system)
[Concepts in Astronomy #10. The Topocentric Coordinate System](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-10-the-topocentric-coordinate-system)
[Concepts in Astronomy #11. Equinox](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-11-equinox)
[Concepts in Astronomy #12. Solstice](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-12-solstice)
[Concepts in Astronomy #13. Rotation Period](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-13-rotation-period)
[Concepts in Astronomy #14. Orbital Period](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-14-orbital-period)
[Concepts in Astronomy #15. Axial Precession](https://steemit.com/astronomy/@marcusantoniu26/concepts-in-astronomy-15-axial-precession)



###### Credits


######  - Galaxy image obtained from Pixabay under [CC0](https://creativecommons.org/publicdomain/zero/1.0/deed.en). No Copyright. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law

###### - Axial Tilt  image obtained from Wikipedia under [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/). Author: Dennis Nilson
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