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Convert astronomical unit to light year

Light Years to Astronomical Units

Astronomical Units to Light Years

Speed of light in astronomical units = 0.002 004 au per second. So 1 light second in au = 0.002 004, or aproximately is equal to 0.002 au. 1 light minute in astronomical units = 0.12024 au, it is aproximately equal to 0.12 au. 1 light hour in au = 7.2144, or aproximatelly equal to 7.2 au. 1 light day in astronomical units = 173.1456 au, it is aproximately equal to 173 au.

ly to au conversion table:

1 ly	= 6.324E+4 au	21 ly	= 1.328E+6 au	41 ly	= 2.593E+6 au	70 ly	= 4.427E+6 au
2 ly	= 1.265E+5 au	22 ly	= 1.391E+6 au	42 ly	= 2.656E+6 au	80 ly	= 5.059E+6 au
3 ly	= 1.897E+5 au	23 ly	= 1.455E+6 au	43 ly	= 2.719E+6 au	90 ly	= 5.692E+6 au
4 ly	= 2.53E+5 au	24 ly	= 1.518E+6 au	44 ly	= 2.783E+6 au	100 ly	= 6.324E+6 au
5 ly	= 3.162E+5 au	25 ly	= 1.581E+6 au	45 ly	= 2.846E+6 au	110 ly	= 6.956E+6 au
6 ly	= 3.794E+5 au	26 ly	= 1.644E+6 au	46 ly	= 2.909E+6 au	120 ly	= 7.589E+6 au
7 ly	= 4.427E+5 au	27 ly	= 1.707E+6 au	47 ly	= 2.972E+6 au	130 ly	= 8.221E+6 au
8 ly	= 5.059E+5 au	28 ly	= 1.771E+6 au	48 ly	= 3.036E+6 au	140 ly	= 8.854E+6 au
9 ly	= 5.692E+5 au	29 ly	= 1.834E+6 au	49 ly	= 3.099E+6 au	150 ly	= 9.486E+6 au
10 ly	= 6.324E+5 au	30 ly	= 1.897E+6 au	50 ly	= 3.162E+6 au	160 ly	= 1.012E+7 au
11 ly	= 6.956E+5 au	31 ly	= 1.96E+6 au	51 ly	= 3.225E+6 au	170 ly	= 1.075E+7 au
12 ly	= 7.589E+5 au	32 ly	= 2.024E+6 au	52 ly	= 3.288E+6 au	180 ly	= 1.138E+7 au
13 ly	= 8.221E+5 au	33 ly	= 2.087E+6 au	53 ly	= 3.352E+6 au	190 ly	= 1.202E+7 au
14 ly	= 8.854E+5 au	34 ly	= 2.15E+6 au	54 ly	= 3.415E+6 au	200 ly	= 1.265E+7 au
15 ly	= 9.486E+5 au	35 ly	= 2.213E+6 au	55 ly	= 3.478E+6 au	300 ly	= 1.897E+7 au
16 ly	= 1.012E+6 au	36 ly	= 2.277E+6 au	56 ly	= 3.541E+6 au	400 ly	= 2.53E+7 au
17 ly	= 1.075E+6 au	37 ly	= 2.34E+6 au	57 ly	= 3.605E+6 au	500 ly	= 3.162E+7 au
18 ly	= 1.138E+6 au	38 ly	= 2.403E+6 au	58 ly	= 3.668E+6 au	700 ly	= 4.427E+7 au
19 ly	= 1.202E+6 au	39 ly	= 2.466E+6 au	59 ly	= 3.731E+6 au	900 ly	= 5.692E+7 au
20 ly	= 1.265E+6 au	40 ly	= 2.53E+6 au	60 ly	= 3.794E+6 au	1000 ly	= 6.324E+7 au

au to ly conversion table:

1 au	= 1.581E-5 ly	21 au	= 3.321E-4 ly	41 au	= 6.483E-4 ly	70 au	= 1.107E-3 ly
2 au	= 3.163E-5 ly	22 au	= 3.479E-4 ly	42 au	= 6.641E-4 ly	80 au	= 1.265E-3 ly
3 au	= 4.744E-5 ly	23 au	= 3.637E-4 ly	43 au	= 6.799E-4 ly	90 au	= 1.423E-3 ly
4 au	= 6.325E-5 ly	24 au	= 3.795E-4 ly	44 au	= 6.958E-4 ly	100 au	= 1.581E-3 ly
5 au	= 7.906E-5 ly	25 au	= 3.953E-4 ly	45 au	= 7.116E-4 ly	110 au	= 1.739E-3 ly
6 au	= 9.488E-5 ly	26 au	= 4.111E-4 ly	46 au	= 7.274E-4 ly	120 au	= 1.898E-3 ly
7 au	= 1.107E-4 ly	27 au	= 4.269E-4 ly	47 au	= 7.432E-4 ly	130 au	= 2.056E-3 ly
8 au	= 1.265E-4 ly	28 au	= 4.428E-4 ly	48 au	= 7.59E-4 ly	140 au	= 2.214E-3 ly
9 au	= 1.423E-4 ly	29 au	= 4.586E-4 ly	49 au	= 7.748E-4 ly	150 au	= 2.372E-3 ly
10 au	= 1.581E-4 ly	30 au	= 4.744E-4 ly	50 au	= 7.906E-4 ly	160 au	= 2.53E-3 ly
11 au	= 1.739E-4 ly	31 au	= 4.902E-4 ly	51 au	= 8.065E-4 ly	170 au	= 2.688E-3 ly
12 au	= 1.898E-4 ly	32 au	= 5.06E-4 ly	52 au	= 8.223E-4 ly	180 au	= 2.846E-3 ly
13 au	= 2.056E-4 ly	33 au	= 5.218E-4 ly	53 au	= 8.381E-4 ly	190 au	= 3.004E-3 ly
14 au	= 2.214E-4 ly	34 au	= 5.376E-4 ly	54 au	= 8.539E-4 ly	200 au	= 3.163E-3 ly
15 au	= 2.372E-4 ly	35 au	= 5.534E-4 ly	55 au	= 8.697E-4 ly	300 au	= 4.744E-3 ly
16 au	= 2.53E-4 ly	36 au	= 5.693E-4 ly	56 au	= 8.855E-4 ly	400 au	= 6.325E-3 ly
17 au	= 2.688E-4 ly	37 au	= 5.851E-4 ly	57 au	= 9.013E-4 ly	500 au	= 7.906E-3 ly
18 au	= 2.846E-4 ly	38 au	= 6.009E-4 ly	58 au	= 9.171E-4 ly	700 au	= 1.107E-2 ly
19 au	= 3.004E-4 ly	39 au	= 6.167E-4 ly	59 au	= 9.33E-4 ly	900 au	= 1.423E-2 ly
20 au	= 3.163E-4 ly	40 au	= 6.325E-4 ly	60 au	= 9.488E-4 ly	1000 au	= 1.581E-2 ly

Guest: 2019-10-02 08:45:31

What is a distance from the earth to the sun in ligh years?

It is equal to 1 astronomical unit or 1.5 * 10 ^-10 . Scientists proved that light travels 8 light-minutes from our planet Earth to the Sun. Obviously, it is impossible to see the current Sun as it is 8 minutes older. There is no doubt the Sun is very close to our planet comparing with the nearest star Proxima Centauri. It is quite understandable there is a huge difference between eight light-minutes and four light-years. In reality it is not easy to imagine such distances. The scientists and the people who are interested in this field are able to understand what enormous distance it is. So there are plenty of significant phenomenons which might be understood mainly for those who want to explore not only our planet Earth but also other objects in the Universe.

Guest: 2024-06-15 06:53:53

The astronomical unit (AU) is a historically established distance measurement unit in astronomy, equal to 149 597 870.610 km. The unit is approximately equal to the average distance between the centers of mass of the Earth and the Sun (i.e., the average radius of the Earth's orbit; the distance from the Earth to the Sun).

The unit is exactly equal to the radius of a circular orbit whose period of revolution, if all bodies in the Solar System except the Sun were neglected, would be exactly equal to the period of the Earth's revolution. The semi-major axis of the Earth's orbit is equal to 1.000000036406 AU. It is used primarily to measure distances between objects in the Solar System, outside solar systems, and between components of binary stars.

Since the advent of the heliocentric system, particularly with the development of Keplerian celestial mechanics, the relative distances within the solar system (excluding the very close Moon) have been known with considerable accuracy. The Sun is the central body of the system. Earth revolves in an almost circular orbit. They both serve as the reference point for observers. Therefore, it was logical to use the radius of Earth's orbit as the unit of measurement. However, at that time, it was not possible to reliably measure this unit or compare it to terrestrial scales. The Sun is too distant for accurate parallax measurement from Earth. While the distance to the Moon was known, the data available in the 17th century did not allow for a reliable estimate of the ratio of distances to the Sun and the Moon. Observations of the Moon lacked the required accuracy, and the ratio of the masses of the Earth and the Sun was also unknown.

In 1672, Giovanni Cassini and his colleague Jean Richet measured the parallax of Mars. With the orbital parameters of Earth and Mars accurately determined, it became possible to calculate the value of the astronomical unit, which is approximately 146 million kilometers in modern terms.

Subsequent measurements of the astronomical unit were achieved using the transits of Venus across the solar disk. Additionally, the approach of the asteroid Eros to Earth in 1901 and the measurement of its parallax allowed for an even more precise estimate.

The unit was further refined through planetary radar observations. In 1961, Venus's position was determined to establish that the unit was equal to 149,599,300 kilometers, with an error probability not exceeding ±2,000 kilometers. A repeat radar observation of Venus in 1962 reduced this uncertainty, refining the value of the unit to 149,598,100 kilometers ±750 kilometers. It was discovered that prior to the 1961 observations, the unit was known with an accuracy of only 0.1%.

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