PHYS 1404 Chapter 4
The diagram below is the same as in the previous question. In the diagram, the Earth is located at the center. You are looking down upon the Earth from above. The black dot in the center of the Earth represents the Earth's north pole. What is the phase of the moon at each of the marked positions?
A - new B - waxing crescent C - first quarter D - waxing gibbous E - full F - waning gibbous G - third quarter H - waning crescent
Which of the follow is a true statement? You can find the tilt of Earth's axis by measuring the angle between your horizon and the North Star. The seasons on Earth are caused by its elliptical orbit around the Sun. It is possible to see the third-quarter Moon near the western horizon at sunrise. It is possible to see the full Moon rising just before sunrise. A solar eclipse occurs only when the Moon is new.
A solar eclipse occurs only when the Moon is new.
What's the season in Tyler Sept 10, 2015? What's the season in Sydney Sept 10, 2015?
Tyler - summer Sydney - Winter
Suppose the date were initially Feb 20, 2015. What is the season in Tyler? What is the season in Sydney, Australia?
Tyler - winter Sydney, Australia - summer
Use the diagram below as an aid to answer these questions. In the diagram, the Earth is located at the center. You are looking down upon the Earth from above. The black dot in the center of the Earth represents the Earth's north pole. The Earth as seen in the figure would rotate in a counter-clockwise fashion. When answering the following three questions, assume you are in Tyler, Texas (or anywhere else in North America) and you notice the Third Quarter moon (position G) rising in the east. Is the Sun also visible? Is the Moon waxing or waning? What time of day will the Moon set? a. Sun is also visible b. Sun is not also visible c. Moon is waxing d. Moon is waning e. Moon will set at sunset f. Moon will set at noon g. Moon will set at midnight h. Moon will set at sunrise
b,d,f
The calendar we use in the USA is _____. the Mayan calendar the North American calendar the Julian calendar the Gregorian calendar
the Gregorian calendar
What phase of the Moon is possible... ...during a lunar eclipse ...during a solar eclipse
..during a lunar eclipse - full moon ...during a solar eclipse - new moon
If you are standing at the Earth's north pole on June 21, how long is the Sun above the horizon? 24 hours 12 hours 18 hours The Sun never rises above the horizon. 10 hours
24 hours
Why is a solar day longer than a sidereal day? How much longer is a solar day? Because of its orbit, the Earth must approximately rotate an additional degree for the Sun to appear at the same position in the sky. Solar day is about 4 minutes longer than the sidereal day. Because the time required for the Sun to appear in the same position in the sky changes with the season. The solar day is approximately 24 hours longer than the sidereal day. Because the position of the Sun depends upon your location on Earth's surface and time is related to position. A solar day is about 1 minute longer than a sidereal day. Because our ordinary clocks are set to solar time, the solar day is longer. The solar day is about 1/365 of a full day longer than the sidereal day.
Because of its orbit, the Earth must approximately rotate an additional degree for the Sun to appear at the same position in the sky. Solar day is about 4 minutes longer than the sidereal day.
When is the Earth closer to the Sun? January 4th July 4th March 4th September 4th
January 4th
Which of the following is true? Lunar eclipses occur during spring tide. Lunar eclipses can only occur at midnight. Solar eclipses can occur during neap tide. Lunar eclipses occur during neap tide.
Lunar eclipses occur during spring tide.
Match the day of the week to the celestial object for which it is named. Monday Wednesday Thursday Sunday Saturday Tuesday Friday
Monday - moon Wednesday - mercury Thursday - jupiter Sunday - sun Saturday - saturn Tuesday - mars Friday - venus
If a star has a declination of +90 degrees, where in the sky is it? North Celestial Pole Ecliptic Celestial Equator Zero hour for Right Ascension
North Celestial Pole
What's the season in Sydney Oct 10, 2015?
Spring
Which of the following is true concerning seasons? It is warmer in the summer because Earth is closer to the Sun. The elliptical orbit of the Earth about the Sun makes summer warmer and the Sun to be in the sky longer. Summer is warmer because the Sun is in the sky longer and its rays strike the surface more directly. The northern hemisphere winter is caused by the frost giants of Jötunheimr warring with Odin causing the Sun's rays to strike the Earth's surface more directly.
Summer is warmer because the Sun is in the sky longer and its rays strike the surface more directly.
Why does the Moon keep the same face toward Earth? The Moon's orbital period equals its rotation period. The Moon's sidereal month is close to its lunar month. The Moon's orbit is highly elliptical. The Moon's face looks the same at all points on its surface.
The Moon's orbital period equals its rotation period.
Spring tide occurs _____. during full or new moon. during first or third quarter moon. during waxing and waning crescent phases. during waxing or waning gibbous phases
during full or new moon.
A total solar eclipse ______ occurs during full moon and neap tide. occurs during full moon and spring tide. occurs during new moon and neap tide. occurs during new moon and spring tide.
occurs during new moon and spring tide.
During neap tide _____. the moon would be in full phase the moon would rise at sunset or sunrise the moon would set around midnight or noon the moon would be in new phase
the moon would set around midnight or noon
What is the ecliptic? the path the Sun appears to trace around the celestial sphere each year the Sun's daily path from east to west in our sky the path traced by the Moon's shadow on Earth during a solar eclipse a half-circle extending from your horizon due north, through your zenith, to your horizon due south all the above
the path the Sun appears to trace around the celestial sphere each year
