Units of measurement in astronomy
The astronomical system of units, formerly called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy. It was adopted by the International Astronomical Union (IAU) in 1976 via Resolution No. 1, and has been significantly updated in 1994 and 2009 (see astronomical constant). The system was developed because of the difficulties in measuring and expressing astronomical data in International System of Units (SI units). In particular, there is a huge quantity of very precise data relating to the positions of objects within the Solar System which cannot conveniently be expressed or processed in SI units. Through a number of modifications, the astronomical system of units now explicitly recognizes the consequences of general relativity, which is a necessary addition to the International System of Units in order to accurately treat astronomical data. The astronomical system of units is a tridimensional system, in that it defines units of length, mass and time. The associated astronomical constants also fix the different frames of reference that are needed to report observations. The system is a conventional system, in that neither the unit of length nor the unit of mass are true physical constants, and there are at least three different measures of time. (Wikipedia).
Teach Astronomy - Astronomical Units
http://www.teachastronomy.com/ The astronomical unit is defined as the mean distance between the Earth and the Sun. It has to be defined as the mean because the orbit is elliptical by a couple of percent. The astronomical unit is 150 million kilometers or 98 million miles. This sets the
From playlist 11. Interplanetary Bodies
Teach Astronomy - Astronomy Units
http://www.teachastronomy.com/ Astronomers use the metric system, but they also use units that are more appropriate to the huge scales of the universe that are encountered in astronomy. In particular they use three different scales of distance. The astronomical unit, the mean distance be
From playlist 01. Fundamentals of Science and Astronomy
Units of MASS in Astronomy ✷ Solar Masses ✷ Jupiter Masses ✷ Earth Masses
Our Socratica Astronomy series is back! Bookmark the playlist here: ✷ https://socratica.link/Astro_Playlist We also ask you join our STELLAR email list so we can notify you when new videos go live: ✷ https://snu.socratica.com/astronomy (Don’t rely on the YT algorithm to show you what
From playlist Astronomy
PARSECS, Light Years, or AU? (Astronomy)
Our Socratica Astronomy series is back! Bookmark the playlist here: ✷ https://socratica.link/Astro_Playlist We also ask you join our STELLAR email list so we can notify you when new videos go live: ✷ https://snu.socratica.com/astronomy (Don’t rely on the YT algorithm to show you what
From playlist Astronomy
Parsecs, astronomical units and light years, distance units explained: fizzics.org
Notes to support this video lesson are here: https://www.fizzics.org/measuring-distance-in-astronomy/ Astronomical units , the parsec and the light year are different units commonly used to measure distances in astronomy. Where they come from and how they relate to our basic units of measu
From playlist Astronomy - physics of measuring distance
Teach Astronomy - Mass, Length and Time
http://www.teachastronomy.com/ Scientists use a system of units based on mass, length, and time. Almost every physical quantity in the world can be reduced to some combination of units of mass, units of length, and units of time. For example area is length times length. Volume is length
From playlist 01. Fundamentals of Science and Astronomy
From playlist Courses and Series
http://www.teachastronomy.com/ The vast distances to the nearest stars encourage astronomers to use a new unit of distance. Whereas meters and kilometers work well on the Earth, and the astronomical unit is the appropriate unit for scales within the solar system, the distance scale to the
From playlist 14. Stars
Teach Astronomy - Scale of the Solar System
http://www.teachastronomy.com/ At the time of Newton's death the solar system was conceived of essentially as we know it today, missing only the three outermost planets, Uranus, Neptune and Pluto. Kepler's laws however only give the relative distances of the planets. To get an absolute me
From playlist 03. Concepts and History of Astronomy and Physics
In this short video explainer, Universe Today publisher Fraser Cain helps you understand the full scale of the Solar System. Where does our Solar System end, and other star systems begin? In short, it's big, really big. http://www.universetoday.com/104486/how-big-is-our-solar-system/ ---
From playlist The Solar System
Did Planet 9 Come from Outer Space? Universe Sandbox 2
Patreon page: https://www.patreon.com/user?u=2318196&ty=h Hello and welcome to What Da Math! In this video, we will talk about whether Planet 9 was captured from another solar system that was passing through our system using Universe Sandbox 2. Is Planet 9 an extrasolar guest? Enjoy and
From playlist Universe Sandbox 2
Astronomy - The Size of the Universe (2 of 6) The Solar System
Visit http://ilectureonline.com for more math and science lectures! In this video I will discusse the size of our solar system.
From playlist ASTRONOMY
Astronomy 101: Measuring the Astronomical Unit
Skynet University: http://skynet.unc.edu/introastro Use Our Telescopes From Anywhere! Astronomy 101: The Solar System Lesson 2: Copernican Revolution Topic: Measuring the Astronomical Unit Next: Newton's Laws of Motion (http://youtu.be/3HtwKhPcibc) Previous: Kepler's Laws of Planet
From playlist UNC: Astronomy 101 by Skynet University | CosmoLearning.org Astronomy
Gravitation: Kepler’s Laws of Planetary Motion, Example Problems
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From playlist Gravitation: Orbital Velocity, Orbital Period, Potential Energy, Kinetic Energy, Mass and Weight
Is Pluto Still a Planet? How About Ceres? (Universe Sandbox 2)
Patreon page: https://www.patreon.com/user?u=2318196&ty=h Hello and welcome to What Da Math! In this video, we will talk about the idea that Pluto and Ceres may still meet our definition of planets, making them...planets, not dwarf planets.. You can read the article here: https://thecon
From playlist Universe Sandbox 2
Astronomy - Ch. 13: Jupiter (2 of 37) Jupiter's Location in the Solar System (Speed = 13.1 km/sec)
ORBITAL SPEED = 13.1 Km/second (correction) Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn about the location and relative distances of Jupiter in comparison with t
From playlist ASTRONOMY 13 JUPITER
Astrophysics: Binary Star System (16 of 40) Elliptical Orbits: A Closer Look
Visit http://ilectureonline.com for more math and science lectures! In this video I will derive the 2 general equation for calculating the eccentricity of a planet around a sun. Next video in this series can be found at: https://youtu.be/2okz-VGkeAI
From playlist ASTROPHYSICS 1 BINARY SYSTEMS & KEPLER'S LAWS