Terms in this set (74)
The remaining 48 ancient constellations that we still recognize today are located
at mid and northern celestial latitudes
What are modern constellations?
They are 88 well defined regions on the celestial sphere
What is the most likely Greek letter name of the second brightest star in the constellation Lyra?
Of these four stars which one appears dimmest in the sky? (-0.5, +2.8, -1.2, +0.7)
mv star W = 2, and mv star X = 5. How many times more visible light do we receive from star W than star X?
The apparent visual magnitude of star A is 2 and the apparent visual magnitude of star B is 1. Based on this information which statement below must be true?
Light output and distance cannot be determined from a star's apparent visual magnitude alone.
If the apparent visual magnitude of the Sun is -26.5 and that of the full moon is -12.5, what is the light intensity ratio of sunlight to moonlight received at Earth on the day of the full moon?
When you observe a star on the celestial equator for a period of a few hours, you notice that it
moves from east to west relative to the horizon
What is responsible for the stars moving westward relative to the horizon?
Earth's rotation on its axis.
At what location on Earth is an observer who has the south celestial pole directly overhead?
At Earth's South Pole (90 degrees South latitude)
At what location on Earth is an observer who has the celestial equator passing through a point directly overhead?
At Earth's equator (0 degrees latitude).
If the tilt of Earth's axis were to change from 23.5 degrees to 0 degrees what celestial circles would coincide for all observers?
The celestial equator and the ecliptic.
Why does the rotational axis of Earth precess?
The Sun and Moon pull on Earth's equatorial bulge.
The precession of Earth's rotational axis causes the location of the
north celestial pole and south celestial pole, vernal equinox and autumnal equinox, summer solstice and winter solstice to change
If you could see the Sun and stars during the daytime for several weeks you would notice that the Sun
moves slowly eastward relative to the stars
Why does the Sun move relative to the stars?
It is due to Earth revolving around the Sun
Why is amount of solar heating less on a clear day in January at northern latitudes than on a clear day in July?
The Sun is above the horizon for less than 12 hours in January in the north. At low Sun angles, the received sunlight is spread over a larger surface area.
When it is autumn in Asia, what season is it in Antarctica?
The five naked-eye planets and three telescopic planets that wander among the stars in the sky are always near the
The Milankovitch hypothesis proposes that the ice ages on Earth are due to long-term changes in the amount of seasonal solar heating brought about by
Changes in the shape of Earth's orbit, precession of Earth's rotational axis, changes in the tilt angle of Earth's rotational axis.
Which describes the motion of the Moon relative to the stars?
The Moon moves eastward relative to the stars about 13 degrees per day.
How does the Moon's motion relative to the stars compare to the Sun's motion relative to the stars?
The Moon moves faster than the Sun and in the same direction.
How does one cycle of the Moon's motion relative to the stars compare to one cycle of the Moon's motion relative to the Sun?
The cycle relative to the stars is shorter than the cycle relative to the Sun.
The time for one cycle of lunar phases is
the same as the time for one cycle of the Moon relative to the Sun.
In one cycle of lunar phases each crescent and gibbous phase has a duration of about one
If the moon reaches Full phase on May 6, it is at _____ phase on May 17.
During Third Quarter phase, the Moon will rise at about
What is a tidal force?
It is a differential gravitational force that acts on the different parts of a body.
The ocean tides on Earth are primarily due to the influence of what celestial body?
How many tidal bulges on planet Earth are due to the Moon's gravitational influence?
The most extreme tides (Spring Tides) on planet Earth occur during which phase of the Moon?
New Moon and Full Moon
What changes occur in the Earth-Moon system due to tidal forces?
Earth's rate of rotation is slowing, the same side of the Moon now always faces Earth, and the Earth-Moon distance is increasing
The least extreme tides (Neap Tides) on planet Earth occur during which moon phase?
First Quarter and Third Quarter
What is true about the umbra of the Moon's shadow?
It is very dark or a total shadow and its "cone" points away from the Sun.
During a total lunar eclipse the Moon is
A reddish color and in Earth's umbra.
Which type of eclipse may be visible to all the people on one side of Earth?
A total lunar eclipse.
What parts of the Sun is visible during the "peak" of a total solar eclipse?
The chromosphere and the corona.
If the Moon is at one of its nodes it must be
on the Ecliptic
A total lunar eclipse occurs when the Moon is
Near the Ecliptic and at full phase
A total solar eclipse occurs when the Moon is
At New phase and near the ecliptic.
The synodic period of the moon is
none of the answers on the quiz
A solar eclipse that occurs when the moon's umbra does not reach Earth's surface is called
an annular solar eclipse.
The saros cycle
was used in ancient times to predict eclipses, is 18 years, 11 1/3 days long, and comes from a Greek word that means repetition.
The _______________ moon is visible above the western horizon a couple of hours before sunrise
The moon moves about _______________ eastward in the sky each night.
During a total lunar eclipse
the moon will glow a coppery red.
On average the moon's umbral shadow is too
short to produce a total solar eclipse.
A total lunar eclipse is
visible to all observers on the side of Earth from which the moon would be visible at that time.
The first quarter moon rises
at about noon.
Total lunar eclipses always occur
during the time of full moon.
Which of the following is not visible during totality of a total solar eclipse?
the photosphere of the sun.
A waxing crescent moon is visible
near the western horizon just after sunset.
During a total lunar eclipse, what is true about the moon?
The moon is in Earth's umbra and the moon is full
A totally eclipsed moon glows coppery red because
red light is better able to pass completely through Earth's atmosphere and reach the moon.
When will the full moon be highest above the southern horizon for an observer in the Northern Hemisphere?
at midnight near the winter solstice
A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second?
A total solar eclipse occurred in Wolf Point, Montana on Feb. 26, 1979. When would this eclipse again be visible in Montana?
within 3 days of March 29, 2033
A dime is 1.8 cm in diameter. At what distance from your eye would you have to hold a dime so that it has the same angular diameter as the full moon?
For an observer at 30° N latitude, what is the maximum angle between the observer's southern horizon and the moon?
The third quarter moon rises at noon.
During an annular eclipse of the sun, the corona of the sun is visible
A total solar eclipse will be visible from the same location on Earth one saros cycle later.
The lunar tides on Earth are making the moon recede from Earth.
The path of totality for a solar eclipse is swept out by the tip of the moon's umbra as the umbra moves over Earth.
A total lunar eclipse is visible only from the path of totality.
If you were on the moon during a total lunar eclipse, the sun would be hidden behind Earth
The totally eclipsed moon glows coppery red because sunlight reaches the moon's surface after passing through Earth's atmosphere
An eclipse season is the interval during which the sun crosses a node of the moon's orbit.
The umbra of the moon's shadow is the region from which no part of the photosphere is visible.
The _______________ is 18 years and 111/3 days long
A solar or lunar eclipse will occur
when the sun is near the line of nodes of the moon and the moon is new or full
An eclipse season is the period of time during which the
sun crosses a node in the moon's orbit.
If the moon enters Earth's shadow but does not reach the umbra, the eclipse is termed
Spring tides occur
at new moon and full moon.