Sample
... The direction in which Earth’s rotation axis points in space changes slowly over the centuries, and we call this change precession. Because of this movement, the celestial poles and therefore the pole star changes slowly in time. So while Polaris is the pole star now, in 13,000 years the star Vega w ...
... The direction in which Earth’s rotation axis points in space changes slowly over the centuries, and we call this change precession. Because of this movement, the celestial poles and therefore the pole star changes slowly in time. So while Polaris is the pole star now, in 13,000 years the star Vega w ...
Earth Moon Sun System PPT
... • Solar eclipses can occur because the Sun and Moon have the same angular diameter in the sky (.5°), so aligned correctly, the moon will either partially or totally block out the sun. • The Sun is 400x larger than the moon, but also exactly 400x further away from Earth than the moon – this is what m ...
... • Solar eclipses can occur because the Sun and Moon have the same angular diameter in the sky (.5°), so aligned correctly, the moon will either partially or totally block out the sun. • The Sun is 400x larger than the moon, but also exactly 400x further away from Earth than the moon – this is what m ...
Earth Moon Sun System PPT
... • Solar eclipses can occur because the Sun and Moon have the same angular diameter in the sky (.5°), so aligned correctly, the moon will either partially or totally block out the sun. • The Sun is 400x larger than the moon, but also exactly 400x further away from Earth than the moon – this is what m ...
... • Solar eclipses can occur because the Sun and Moon have the same angular diameter in the sky (.5°), so aligned correctly, the moon will either partially or totally block out the sun. • The Sun is 400x larger than the moon, but also exactly 400x further away from Earth than the moon – this is what m ...
Chapter 2 - Colorado Mesa University
... • Why do we see phases of the Moon? • How can we tell time by the phase and position of the moon The moon is thought to have been formed by a huge impact with the Earth early in our planets history The moon is ~ 1.25-1.5 light seconds away, how far is that? The moon is slowly moving away from us but ...
... • Why do we see phases of the Moon? • How can we tell time by the phase and position of the moon The moon is thought to have been formed by a huge impact with the Earth early in our planets history The moon is ~ 1.25-1.5 light seconds away, how far is that? The moon is slowly moving away from us but ...
EXAM #1 (practice)
... Figure 2 shows a time-exposure photograph of the night sky. Based on the length of the star trails in this photograph, approximately how long was the camera shutter left open and the film (or digital-detector) exposed? ANSWER. ...
... Figure 2 shows a time-exposure photograph of the night sky. Based on the length of the star trails in this photograph, approximately how long was the camera shutter left open and the film (or digital-detector) exposed? ANSWER. ...
NATS1311_091108_bw - The University of Texas at Dallas
... - time it takes for Earth to complete one orbit relative to the stars or the time for the Sun to return to the same position in respect to the stars - the orbital period of the Earth Tropical year - calendar year - time from spring equinox to spring equinox about 20 minutes shorter than a sidereal y ...
... - time it takes for Earth to complete one orbit relative to the stars or the time for the Sun to return to the same position in respect to the stars - the orbital period of the Earth Tropical year - calendar year - time from spring equinox to spring equinox about 20 minutes shorter than a sidereal y ...
PHYS-638-07f: Problem set #0 Solutions
... than it would otherwise be, much like a blanket at night keeps our skin at a higher temperature than it would otherwise be. Bottom line: the greenhouse effect and the albedo effect roughly cancel, making the simple blackbody temperature in part (a) come out about right! 4. Parallax of Mars: In 1672, ...
... than it would otherwise be, much like a blanket at night keeps our skin at a higher temperature than it would otherwise be. Bottom line: the greenhouse effect and the albedo effect roughly cancel, making the simple blackbody temperature in part (a) come out about right! 4. Parallax of Mars: In 1672, ...
DEU 5e Chapter 1 Lecture PPT
... noontime sky, stays up the shortest time, and its light and heat are least intense (most spread out) of any day of the year in the northern hemisphere. (b) On the vernal equinox―first day of spring―the Sun rises precisely in the east and sets precisely in the west. Its light and heat have been growi ...
... noontime sky, stays up the shortest time, and its light and heat are least intense (most spread out) of any day of the year in the northern hemisphere. (b) On the vernal equinox―first day of spring―the Sun rises precisely in the east and sets precisely in the west. Its light and heat have been growi ...
The following voc. are listed in the order that we received them in
... Polaris- The current star to which the North Celestial Pole of Earth points; also called the “North Star”. Equinox-either of two times of the year (fall or spring) during a planet’s orbit when he north and south poles are equidistant from the Sun, causing day and night to be equal length. Solstice- ...
... Polaris- The current star to which the North Celestial Pole of Earth points; also called the “North Star”. Equinox-either of two times of the year (fall or spring) during a planet’s orbit when he north and south poles are equidistant from the Sun, causing day and night to be equal length. Solstice- ...
Earth and Space - Pearson SuccessNet
... You cannot see the moon when the lighted half faces away from Earth. During a new moon, you cannot see the moon at all. The moon’s unlighted side faces Earth. After a new moon, you see more of the moon each day. Only a thin part of the lighted side is facing Earth during a crescent moon. During a fi ...
... You cannot see the moon when the lighted half faces away from Earth. During a new moon, you cannot see the moon at all. The moon’s unlighted side faces Earth. After a new moon, you see more of the moon each day. Only a thin part of the lighted side is facing Earth during a crescent moon. During a fi ...
Eratosthenes Determines the Size of the Earth in about 200 B.C.
... • Because of the tilt of the Earth's rotation axis, the Sun seems to travel on a path on the celestial sphere, the “ecliptic”, which is tilted 23.5° with respect to the celestial equator. • It appears to us that the Sun travels around the Celestial Sphere once a year. A parallax effect: as we orbi ...
... • Because of the tilt of the Earth's rotation axis, the Sun seems to travel on a path on the celestial sphere, the “ecliptic”, which is tilted 23.5° with respect to the celestial equator. • It appears to us that the Sun travels around the Celestial Sphere once a year. A parallax effect: as we orbi ...
3-planets-of-the-solar-system
... At that very moment, unknown to the audience, an asteroid named Hermes halfway between Mars and Jupiter was beginning a long plunge toward our planet. Six months later it would pass 300,000 miles from Earth’s orbit, only a little more than the distance to the Moon.... Hermes approaches Earth’s orbit ...
... At that very moment, unknown to the audience, an asteroid named Hermes halfway between Mars and Jupiter was beginning a long plunge toward our planet. Six months later it would pass 300,000 miles from Earth’s orbit, only a little more than the distance to the Moon.... Hermes approaches Earth’s orbit ...
Lookback Time in Our Everyday Lives
... Stellar distances and the 3D nature of the heavens We use the Astronomical Unit as our unit of length for measuring distances in the Solar System. However, because stellar distances are so large, astronomers use another unit of length, the light-year (ly). The light-year is defined as the distance ...
... Stellar distances and the 3D nature of the heavens We use the Astronomical Unit as our unit of length for measuring distances in the Solar System. However, because stellar distances are so large, astronomers use another unit of length, the light-year (ly). The light-year is defined as the distance ...
January-February-March - WVU Planetarium
... This is when the Earth is closest to the Sun at 0.983 AU or about 91,376,000 miles. On Independence Day, July 4, the Earth will be at aphelion when Earth-Sun distance is at its greatest, 1.02 AU’s or about 94,815,000 miles. An AU (astronomical unit) is equal to about 92,955,000 miles and is the aver ...
... This is when the Earth is closest to the Sun at 0.983 AU or about 91,376,000 miles. On Independence Day, July 4, the Earth will be at aphelion when Earth-Sun distance is at its greatest, 1.02 AU’s or about 94,815,000 miles. An AU (astronomical unit) is equal to about 92,955,000 miles and is the aver ...
Basic Astronomical Estimates
... Alpha Centauri was discovered in the 1800’s and became the first star to have its distance measured in 1833 [15, 16] by Thomas Henderson (1798-1844). However, as Henderson had doubts about the accuracy of his instruments he did not publish his work until 1839, a year after Friedrich Wilhelm Bessel ( ...
... Alpha Centauri was discovered in the 1800’s and became the first star to have its distance measured in 1833 [15, 16] by Thomas Henderson (1798-1844). However, as Henderson had doubts about the accuracy of his instruments he did not publish his work until 1839, a year after Friedrich Wilhelm Bessel ( ...
Fourth Grade Earth in the Universe - K
... • 1.E.1 Recognize the features and patterns of the earth/moon/sun system as observed from Earth. • 1.E.1.1 Recognize differences in the features of the day and night sky and apparent movement of objects across the sky as observed from Earth. • 1.E.1.2 Recognize patterns of observable changes in the ...
... • 1.E.1 Recognize the features and patterns of the earth/moon/sun system as observed from Earth. • 1.E.1.1 Recognize differences in the features of the day and night sky and apparent movement of objects across the sky as observed from Earth. • 1.E.1.2 Recognize patterns of observable changes in the ...
question sheet
... 2. (A) Go to your diagram of the Earth/Sun system (from 3/24) and add an Earth (with axis) for Fall, an Earth (with axis) for Spring, and an Earth (w/axis) for Summer (use pencil!). LABEL the season for each Earth. (B) What parts of the diagram are unrealistically portrayed? Why do we use this diagr ...
... 2. (A) Go to your diagram of the Earth/Sun system (from 3/24) and add an Earth (with axis) for Fall, an Earth (with axis) for Spring, and an Earth (w/axis) for Summer (use pencil!). LABEL the season for each Earth. (B) What parts of the diagram are unrealistically portrayed? Why do we use this diagr ...
The Earth-Moon-Sun System
... time), which is almost 4 minutes shorter than the mean solar day This difference results because the direction to distant stars barely changes because of Earth’s slow revolution along it orbit The direction to the sun, on the other hand, changes by almost 1 degree each day ...
... time), which is almost 4 minutes shorter than the mean solar day This difference results because the direction to distant stars barely changes because of Earth’s slow revolution along it orbit The direction to the sun, on the other hand, changes by almost 1 degree each day ...
Objects in the Sky STair
... The Earth rotates on its axis every 24 hours. As Earth rotates, it gives the appearance that the sun “rises in the sky” every morning and “sets or goes down in the sky” every night When it rises here, it is setting on the other side of Earth and when it is setting here, it is rising on the other sid ...
... The Earth rotates on its axis every 24 hours. As Earth rotates, it gives the appearance that the sun “rises in the sky” every morning and “sets or goes down in the sky” every night When it rises here, it is setting on the other side of Earth and when it is setting here, it is rising on the other sid ...
3-planets-of-the-solar-system
... At that very moment, unknown to the audience, an asteroid named Hermes halfway between Mars and Jupiter was beginning a long plunge toward our planet. Six months later it would pass 300,000 miles from Earth’s orbit, only a little more than the distance to the Moon.... Hermes approaches Earth’s orbit ...
... At that very moment, unknown to the audience, an asteroid named Hermes halfway between Mars and Jupiter was beginning a long plunge toward our planet. Six months later it would pass 300,000 miles from Earth’s orbit, only a little more than the distance to the Moon.... Hermes approaches Earth’s orbit ...
7.4 – Universal Gravitation
... The moon rotates once on its axis in the same amount of time as it revolves around the Earth, therefore a “day” and a “year” on the moon are approximately the same length. This is the reason why the same side of the moon always faces Earth. Phases of the Moon The moon does not produce light, but sim ...
... The moon rotates once on its axis in the same amount of time as it revolves around the Earth, therefore a “day” and a “year” on the moon are approximately the same length. This is the reason why the same side of the moon always faces Earth. Phases of the Moon The moon does not produce light, but sim ...
Problem Set 1 - Cambridge University Press
... If the planets are formed by accretion of smaller bodies, then as larger bodies grew they would "eat up" the smaller bodies. Thus, planets sweep up the space around them of smaller bodies and leave larger and larger swaths between them as one goes outward to planets with wider and wider orbits aroun ...
... If the planets are formed by accretion of smaller bodies, then as larger bodies grew they would "eat up" the smaller bodies. Thus, planets sweep up the space around them of smaller bodies and leave larger and larger swaths between them as one goes outward to planets with wider and wider orbits aroun ...
How Do We Know the Earth is Spherical?
... • Spherical Earth “rotates” once in 24 hours (we will see next time that it’s actually 23h 56m) ...
... • Spherical Earth “rotates” once in 24 hours (we will see next time that it’s actually 23h 56m) ...
The Orrery - Eli Whitney Museum
... has a maximum angle of 21 degrees. If the Sun was just on the horizon, the highest Venus could be is 35 degrees up. In reality, to view the Stars and the Planets, the Sun must have set for some period of time – about an hour or so. An hour relates to 15 degrees of the Earth’s rotation. When that 15 ...
... has a maximum angle of 21 degrees. If the Sun was just on the horizon, the highest Venus could be is 35 degrees up. In reality, to view the Stars and the Planets, the Sun must have set for some period of time – about an hour or so. An hour relates to 15 degrees of the Earth’s rotation. When that 15 ...
Astronomy on Mars
In many cases astronomical phenomena viewed from the planet Mars are the same or similar to those seen from Earth but sometimes (as with the view of Earth as an evening/morning star) they can be quite different. For example, because the atmosphere of Mars does not contain an ozone layer, it is also possible to make UV observations from the surface of Mars.