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The Sun - Sophia
The Sun - Sophia

... • Stars range from very bright (supergiants) to very dim (dwarfs) • Stars range from very hot blue on the outside (O class) to cool red on the outside (M class) ...
Define the following terms in the space provided
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Copernican Revolution Part 1
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DO IT YOURSELF SIMPLE TEMPLATE FORMAT
DO IT YOURSELF SIMPLE TEMPLATE FORMAT

... Our Solar System consists of many types of objects circling around the Sun, held in their orbits by gravity. Name all of the objects you can think of that orbit the Sun. Write down what you know about each one. This activity will look specifically at planets, which are relatively large objects circl ...
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General Astronomy - Stockton University
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ASTRONOMY CURRICULUM Unit 1: Introduction to Astronomy
ASTRONOMY CURRICULUM Unit 1: Introduction to Astronomy

... ●   Orbits of planets in the solar system have varying eccentricities based on the distance between the two focal points of the ellipse. ●   Orbits of the individual planets can be tracked and measured, and retrograde motion can be explained based on the regular patterns of the orbits. ●   Kepler’s ...
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... star, one should have a periodic change in that rate, except for the extreme case in which the plane of the orbit is perpendicular to our line of sight. In our discussion we assume that the motions of the earth relative to the sun have already been taken into account, as well as any long-term steady ...
ASTRONOMY CURRICULUM Unit 1: Introduction to Astronomy
ASTRONOMY CURRICULUM Unit 1: Introduction to Astronomy

... ● Orbits of planets in the solar system have varying eccentricities based on the distance between the two focal points of the ellipse. ● Orbits of the individual planets can be tracked and measured, and retrograde motion can be explained based on the regular patterns of the orbits. ● Kepler’s three ...
Theories of Cosmic Evolution - DigitalCommons@University of
Theories of Cosmic Evolution - DigitalCommons@University of

... the vast majority of these nebulre are of the peculiar type known as spiral. And where the structure can be at all made out, they are two-armed spirals; that is, they consist of a brighter central nucleus, from which emerge, at exactly opposite sides, two fainter arms or coils, which wind around the ...
Lecture 1: Our Place in Space
Lecture 1: Our Place in Space

... • Sidereal Day = The time it takes for a star or constellation to complete one cycle in the sky, returning to the same place it was observed the previous day. (sidus which is Latin = star) 23hr 56min. ...
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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.
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