Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 3, Problem 2RQ
If Earth did not rotate, could you still define the ecliptic? Why or why not?
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The Earth covers about 1° per day in its orbit about the Sun, and the solar
day is slightly longer than the sidereal day. If Earth spun in a retrograde
direction like Venus but it still had the same sidereal period (23 hr 56
min), how long would the solar day be?
The solar day would be
72 hr and
min.
What is the difference between a sidereal month and a synodic month? Which is longer?
Why?
The sidereal day is one rotation of the Earth relative to the
The
day is longer by 4 minutes.
O Sun; stars; solar
O Stars; sun; solar
O Sun; stars; sidereal
O Stars; sun; sidereal
while the solar day is one rotation of the Earth relative to the
Chapter 3 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 3 - What is the difference between the daily and...Ch. 3 - If Earth did not rotate, could you still define...Ch. 3 - What would the seasons be like if Earth were...Ch. 3 - Why are the seasons reversed in the Southern...Ch. 3 - Prob. 5RQCh. 3 - Do the phases of the Moon look the same from every...Ch. 3 - What phase would Earth be in if you were on the...Ch. 3 - Why have most people seen a total lunar eclipse,...Ch. 3 - Why isn’t there an eclipse at every new moon and...Ch. 3 - Why is the Moon red during a total lunar eclipse?
Ch. 3 - Why should the eccentricity of Earth’s orbit make...Ch. 3 - Prob. 12RQCh. 3 - Prob. 13RQCh. 3 - How Do We know? Why must a scientific argument...Ch. 3 - You are packing for a vacation on a planet...Ch. 3 - You happen to visit the Moon when some people on...Ch. 3 - Given that Earth is about 4.6 billion (4.6109)...Ch. 3 - Identify the phases of the Moon if on March 20 the...Ch. 3 - Identify the phases of the Moon if at sunset in...Ch. 3 - Prob. 4PCh. 3 - Draw a diagram showing Earth, the Moon, and...Ch. 3 - Phobos, one of the moons of Mars, is about 25 km...Ch. 3 - A total eclipse of the Sun was visible from Canada...Ch. 3 - Prob. 8PCh. 3 - The cartoon in Figure UN 3-4 shows a crescent...Ch. 3 - The photo in Figure UN 3-5 shows the annular...
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- In a part of Earth’s orbit where Earth is moving faster than usual around the Sun, would the length of the solar day change? If so, how? Explain.arrow_forwardIs the ecliptic the same thing as the celestial equator? Explain.arrow_forwardSuppose you are on a strange planet and observe, at night, that the stars do not rise and set, but circle parallel to the horizon. Next, you walk in a constant direction for 8000 miles, and at your new location on the planet, you find that all stars rise straight up in the east and set straight down in the west, perpendicular to the horizon. How could you determine the circumference of the planet without any further observations? What is the circumference, in miles, of the planet?arrow_forward
- In a part of Earth’s orbit where Earth is moving faster than usual around the Sun, would the length of the sidereal day change? If so, how? Explain.arrow_forwardOn the day of the vernal equinox, the day length for all places on Earth is actually slightly longer than 12 hours. Explain why.arrow_forwardWhat is the latitude of the North Pole? The South Pole? Why does longitude have no meaning at the North and South Poles?arrow_forward
- Suppose Earth took exactly 300.0 days to go around the Sun, and everything else (the day, the month) was the same. What kind of calendar would we have? How would this affect the seasons?arrow_forwardOn a globe or world map, find the nearest marked latitude line to your location. Is this an example of a great circle? Explain.arrow_forwardThe earth revolves around the sun in exactly 365 1/4 days which is equivalent to 1 year. To make up for the loss of 1/4 day, the calendar was adjusted so that we have a leap year for every 4 years. If the earth were to speed in its motion slightly so that a year would be completed in exactly 365 days and 6 hours, how often would we need to have a leap year?arrow_forward
- How to know the time zones.arrow_forwardIf Earth rotated once every 48 hours, and everything else was the same, which of the following statements would not be true? High tide would happen less frequently. The length of a day would be longer. The length of the year would be longer. The daytime temperatures would be higher on average. There would still be summer and winter in the temperature zones.arrow_forwardTonight you see a waning crescent in the night sky. A few (n) days later, the night is once again clear and you see a waning crescent. How many degrees did the Moon advance in its orbit during this time frame?arrow_forward
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