• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
I. Layers of the Sun
I. Layers of the Sun

... 99% of all the matter in our solar system is in the sun. The sun is the center of the solar system. The sun is a main-sequence star. The sun produces energy by fusion. 75% Hydrogen and 25% Helium fuse in the core. ...
Early Observers (The Beginnings of Astronomy)
Early Observers (The Beginnings of Astronomy)

... paths as they traveled around the Earth (epicycles and deferents) Popular model of universe for 1,500 years. ...
Stars - Sun
Stars - Sun

... • The radiant energy of the Sun reaches Earth in the form of electromagnetic waves. • We can use solar energy to heat buildings and generate electricity. ...
Astronomers use astronomical units(AU) to measure distances
Astronomers use astronomical units(AU) to measure distances

... Our Solar System • The Sun’s gravitational pull keeps the planets revolving in orbit around it – Gravitational pull: the force of attraction that two masses have for each other – Orbit: the circular or elliptical path of one object around another Demo ...
File
File

... 24 hours in a day is caused by Earth’s ____________ on its axis. The term to describe Mars’ apparent backyards movement in the night sky is __________________. Space debris that hits the Earth’s surface is called ___________________. This is an explanation of how our Sun and planets formed: ________ ...
Kepler`s Laws (ANSWER KEY)
Kepler`s Laws (ANSWER KEY)

... (Giancoli, p 142, #53) Neptune is an average distance of 4.5 × 10 9 km from the Sun. Estimate the length of the Neptunian year given that the Earth is 1.50 × 10 8 km from the Sun on the average. 1.6 x 102 year ...
Bodies of our Solar System
Bodies of our Solar System

... • Only planet where water exists in all three phases (solid, liquid, gas) • Appropriate distance to support life • Atmosphere provides protection from cosmic rays (uv rays) that harm ...
Quiz # 2 - Oglethorpe University
Quiz # 2 - Oglethorpe University

... 1.) The four seasons—spring, summer, fall, winter—are caused primarily by A. the same side of the Moon always being pointed toward the Earth. B. the changing distance from the Earth to the Sun. C. the tilt of the Earth’s equatorial plane with respect to its orbit. D. changing temperatures of the Sun ...
Quiz 2 Key - Oglethorpe University
Quiz 2 Key - Oglethorpe University

... 1.) The four seasons—spring, summer, fall, winter—are caused primarily by A. the same side of the Moon always being pointed toward the Earth. B. the changing distance from the Earth to the Sun. C. the tilt of the Earth’s equatorial plane with respect to its orbit. D. changing temperatures of the Sun ...
Today`s Powerpoint
Today`s Powerpoint

... Use the theory to predict future behavior Make further observations to test the theory Refine the theory, or if it no longer works, make a new one ...
STARS In your textbook, read about the properties of the Sun and
STARS In your textbook, read about the properties of the Sun and

... 6. Stars on the main sequence produce energy by fusing hydrogen into----' 7. As a contracts, its rotation forces it into a disk shape with a hot condensed object at the center, which will become a new stsr. 8. During a the entire portion of the star is blown off in a massive explosion! What are Gala ...
The Sun - Hicksville Public Schools
The Sun - Hicksville Public Schools

... radiate as much energy as the Sun would emit over 10 billion years. The explosion expels much or all of a star's material at high velocity, driving a shock wave into the surrounding interstellar medium, where it sweeps up an expanding shell of gas and dust called a supernova remnant. ...
Astronomy Review
Astronomy Review

... The apparent motions of the Sun, Moon, Planets, and stars across the sky can be explained by Earth’s rotation and revolution. Earth’s rotation on its axis causes the length of one day to be approximately 24 hours. This rotation also causes the Sun and Moon to appear to rise along the eastern horizo ...
Astronomy Study Guide
Astronomy Study Guide

... The apparent motions of the Sun, Moon, Planets, and stars across the sky can be explained by Earth’s rotation and revolution. Earth’s rotation on its axis causes the length of one day to be approximately 24 hours. This rotation also causes the Sun and Moon to appear to rise along the eastern horizo ...
Chapter 1 - Humble ISD
Chapter 1 - Humble ISD

... • Northernmost point of path (above celestial equator) is ____________________________; southernmost is _____________________; points where path crosses celestial equator are _________________________________________ • Combination of _______________________________________________ gives seasons • Ti ...
NAME - Net Start Class
NAME - Net Start Class

... 6. Place the following stars in sequence from least to greatest in magnitude: Rigel, Procyon, Barnard’s Star, Sirius B 7. What two stars are cooler than the Sun but warmer than Tau Ceti? ...
Mod three revision
Mod three revision

... mass: 5.972e24 kg ...
the sun - WordPress.com
the sun - WordPress.com

... The mass of the Sun is approximately 330,000 times greater than that of Earth. It is almost three quarters Hydrogen, whilst most of the remaining mass is Helium. ...
File
File

... A group of stars that form a pattern in the night sky that are used to locate celestial objects ...
HELP
HELP

...  the movement of the Earth causes the apparent daily and annual movement of the Sun and other stars  the relative positions of the Earth, Sun and planets in the Solar System; phases of the Moon, eclipses, seasons  planets and satellites are seen by reflected light and the Sun, as a star, emits li ...
Study Guide Astronomy
Study Guide Astronomy

... Know the definitions of the following terms. Revolution: ___The movement of an object around another object. ________________ Rotation: Movement of an object as it spins on it’s axis Earth’s rotation= 1 day 24 hours Ecliptic: apparent path of the sun as it appears to move across the sky Equinox: the ...
handout
handout

... C. Looking east, you see stars rising and moving to the upper _________________ (south) D. Looking south, you see stars moving to the __________________ (west) V. The Sun and its Motions A. ...
ASTR100 Fall 2009: Exam #2 Review Sheet EXAM IS THURSDAY
ASTR100 Fall 2009: Exam #2 Review Sheet EXAM IS THURSDAY

... 3] What color of visible light has the most energy? ________ Why? ________________ 4] Name the four ways light interacts with matter: _______, _______, _______, ______. 5] What type of spectrum will a neon light produce? ____________________________ 6] What type of spectrum will a regular filament l ...
Stars - Independence High School
Stars - Independence High School

... seen during certain times of the year ...
Small Bodies in our Solar System
Small Bodies in our Solar System

... Between Mars and Jupiter ...
< 1 ... 204 205 206 207 208 209 210 211 212 ... 228 >

Tropical year

A tropical year (also known as a solar year), for general purposes, is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice. Because of the precession of the equinoxes, the seasonal cycle does not remain exactly synchronized with the position of the Earth in its orbit around the Sun. As a consequence, the tropical year is about 20 minutes shorter than the time it takes Earth to complete one full orbit around the Sun as measured with respect to the fixed stars (the sidereal year).Since antiquity, astronomers have progressively refined the definition of the tropical year. The Astronomical Almanac Online Glossary 2015 states:year, tropical:the period of time for the ecliptic longitude of the Sun to increase 360 degrees. Since the Sun's ecliptic longitude is measured with respect to the equinox, the tropical year comprises a complete cycle of seasons, and its length is approximated in the long term by the civil (Gregorian) calendar. The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds.An equivalent, more descriptive, definition is ""The natural basis for computing passing tropical years is the mean longitude of the Sun reckoned from the precessionally moving equinox (the dynamical equinox or equinox of date). Whenever the longitude reaches a multiple of 360 degrees the mean Sun crosses the vernal equinox and a new tropical year begins"". (Borkowski 1991, p. 122)The mean tropical year on January 1, 2000, was about 365.2421897 ephemeris days according to the calculation of Laskar (1986); each ephemeris day lasting 86,400 SI seconds. By 2010 this had decreased to 365.2421891 (365 ephemeris days, 5 hours, 48 minutes and 45.14 seconds). This is about 365.242181 mean solar days, though the length of a mean solar day is constantly changing.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report