Òrùn

Òòrùn ni ìràwọ̀ tó wà láàárín ètò òòrùn. Ilẹ̀-ayé àti àwọn ohun mìíràn (àwọn pílánẹ́ẹ̀tì yoku, oníràwọ̀, olókùúta, òkúta iná àti eruku) wọ́n ń yípo òòrùn, tó ṣe fúnra rẹ̀ nìkan ni ìtóbi 99.8% gbogbo Ètò Òòrùn. Okun láti inú òòrùn gẹ́gẹ́ bíi ooruntitan ń pèsè fún àwọn ohun ẹlẹ́mìí lọ́nà tí a mọ̀ sí ikommolejo (photosynthesis), bẹ́ẹ̀ ni òòrùn ló ń sọ bí ìgbà àti ojú-ọjọ́ ṣe ń rí.

Ooru nwo

Òrùn

Observation data
Mean distance from Earth	1.496×108 km 8 min 19 s at light speed
Visual brightness (V)	−26.74 [1]
Absolute magnitude	4.83 [1]
Spectral classification	G2V
Metallicity	Z = 0.0122[2]
Angular size	31.6′ – 32.7′ [3]
Adjectives	solar
Orbital characteristics
Mean distance from Milky Way core	~2.5×1017 km 26,000 light-years
Galactic period	(2.25–2.50) × 108 a
Velocity	~220 km/s (orbit around the center of the Galaxy) ~20 km/s (relative to average velocity of other stars in stellar neighborhood) ~370 km/s[4] (relative to the cosmic microwave background)
Physical characteristics
Mean diameter	1.392×106 km [1] 109 × Earth
Equatorial radius	6.955×105 km [5] 109 × Earth[5]
Equatorial circumference	4.379×106 km [5] 109 × Earth[5]
Flattening	9×10−6
Surface area	6.0877×1012 km2 [5] 11,990 × Earth[5]
Volume	1.412×1018 km3 [5] 1,300,000 × Earth
Mass	1.9891×1030 kg[1] 333,000 × Earth[1]
Average density	1.408×103 kg/m3 [1][5][6]
Density	Center (model): 1.622×105 kg/m3 [1] Lower photosphere: 2×10−4 kg/m3 Lower chromosphere: 5×10−6 kg/m3 Corona (avg.): 1×10−12 kg/m3 [7]
Equatorial surface gravity	274.0 m/s2 [1] 27.94 g 28 × Earth[5]
Escape velocity (from the surface)	617.7 km/s [5] 55 × Earth[5]
Temperature	Center (modeled): ~1.57×107 K [1] Photosphere (effective): 5,778 K [1] Corona: ~5×106 K
Luminosity (Lsol)	3.846×1026 W [1] ~3.75×1028 lm ~98 lm/W efficacy
Mean Intensity (Isol)	2.009×107 W·m−2·sr−1
Rotation characteristics
Obliquity	7.25° [1] (to the ecliptic) 67.23° (to the galactic plane)
Right ascension of North pole[8]	286.13° 19h 4min 30s
Declination of North pole	+63.87° 63°52' North
Sidereal rotation period (at equator)	25.05 days [1]
(at 16° latitude)	25.38 days [1] 25d 9h 7min 12s [8]
(at poles)	34.4 days [1]
Rotation velocity (at equator)	7.189×103 km/h [5]
Photospheric composition (by mass)
Hydrogen	73.46%[9]
Helium	24.85%
Oxygen	0.77%
Carbon	0.29%
Iron	0.16%
Neon	0.12%
Nitrogen	0.09%
Silicon	0.07%
Magnesium	0.05%
Sulfur	0.04%
This box: wo ọ̀rọ̀ àtúnṣe

Òòrùn

Itokasi

1. Williams, D. R. (2004). "Sun Fact Sheet". NASA. Retrieved 2010-09-27.
2. Asplund, M.; N. Grevesse and A. J. Sauval (2006). "The new solar abundances - Part I: the observations". Communications in Asteroseismology 147: 76–79. Bibcode 2006CoAst.147...76A. doi:10.1553/cia147s76.
3. "Eclipse 99: Frequently Asked Questions". NASA. Retrieved 2010-10-24.
4. Hinshaw, G.; et al. (2009). "Five-year Wilkinson Microwave Anisotropy Probe observations: data processing, sky maps, and basic results". The Astrophysical Journal Supplement Series 118: 225–245. Bibcode 2009ApJS..180..225H. doi:10.1088/0067-0049/180/2/225.
5. "Solar System Exploration: Planets: Sun: Facts & Figures". NASA. Archived from the original on 2008-01-02.
6. Ko, M. (1999). Elert, G., ed. "Density of the Sun". The Physics Factbook.
7. "Principles of Spectroscopy". University of Michigan, Astronomy Department. 30 August 2007.
8. Seidelmann, P. K. (2000). "Report Of The IAU/IAG Working Group On Cartographic Coordinates And Rotational Elements Of The Planets And Satellites: 2000". Retrieved 2006-03-22. Unknown parameter |coauthors= ignored (|author= suggested) (help)
9. "The Sun's Vital Statistics". Stanford Solar Center. Retrieved 2008-07-29., citing Eddy, J. (1979). A New Sun: The Solar Results From Skylab. NASA. p. 37. NASA SP-402. http://history.nasa.gov/SP-402/contents.htm.