Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 4, Problem 20E
Explain why the Gregorian calendar modified the nature of the leap year from its original definition in the Julian calendar.
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Chapter 4 Solutions
Astronomy
Ch. 4 - Discuss how latitude and longitude on Earth are...Ch. 4 - What is the latitude of the North Pole? The South...Ch. 4 - Make a list of each main phase of the Moon,...Ch. 4 - What are advantages and disadvantages of apparent...Ch. 4 - What are the two ways that the tilt of Earth’s...Ch. 4 - Why is it difficult to construct a practical...Ch. 4 - Explain why there are two high tides and two low...Ch. 4 - What is the phase of the Moon during a total solar...Ch. 4 - On a globe or world map, find the nearest marked...Ch. 4 - Explain three lines of evidence that indicate that...
Ch. 4 - What is the origin of the terms “a.m.” and “p.m.”...Ch. 4 - Explain the origin of the leap year. Why is it...Ch. 4 - Explain why the year 1800 was not a leap year,...Ch. 4 - What fraction of the Moon’s visible face is...Ch. 4 - Why don’t lunar eclipses happen during every full...Ch. 4 - Why does the Moon create tidal bulges on both...Ch. 4 - Why do the heights of the tides change over the...Ch. 4 - Explain how tidal forces are causing Earth to slow...Ch. 4 - Explain how tidal forces are causing the Moon to...Ch. 4 - Explain why the Gregorian calendar modified the...Ch. 4 - The term equinox translates as “equal night.”...Ch. 4 - The term solstice translates as “Sun stop.”...Ch. 4 - Why is the warmest day of the year in the United...Ch. 4 - When Earth’s Northern Hemisphere is tilted toward...Ch. 4 - Where are you on Earth if you experience each of...Ch. 4 - In countries at far northern latitudes, the winter...Ch. 4 - What is the phase of the Moon if it . . . A. rises...Ch. 4 - A car accident occurs around midnight on the night...Ch. 4 - The secret recipe to the ever-popular veggie...Ch. 4 - Your great-great-grandfather, who often...Ch. 4 - One year in the future, when money is no object,...Ch. 4 - Suppose you lived in the crater Copernicus on the...Ch. 4 - In a lunar eclipse, does the Moon enter the shadow...Ch. 4 - Describe what an observer at the crater Copernicus...Ch. 4 - The day on Mars is 1.026 Earth-days long. The...Ch. 4 - What is the right ascension and declination of the...Ch. 4 - What is the right ascension and declination of the...Ch. 4 - What is the right ascension and declination of the...Ch. 4 - During summer in the Northern Hemisphere, the...Ch. 4 - On the day of the vernal equinox, the day length...Ch. 4 - Regions north of the Arctic Circle are known as...Ch. 4 - In a part of Earth’s orbit where Earth is moving...Ch. 4 - In a part of Earth’s orbit where Earth is moving...Ch. 4 - If Sirius rises at 8:00 p.m. tonight, at what time...Ch. 4 - What are three lines of evidence you could use to...Ch. 4 - If the Moon rises at a given location at 6:00 p.m....Ch. 4 - Explain why some solar eclipses are total and some...Ch. 4 - Why do lunar eclipses typically last much longer...Ch. 4 - Suppose Earth took exactly 300.0 days to go around...Ch. 4 - Consider a calendar based entirely on the day and...Ch. 4 - If a star rises at 8:30 p.m. tonight,...Ch. 4 - What is the altitude of the Sun at noon on...Ch. 4 - Show that the Gregorian calendar will be in error...
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- Explain the origin of the leap year. Why is it necessary?arrow_forwardShow that the Gregorian calendar will be in error by 1 day in about 3300 years.arrow_forwardConsider a calendar based entirely on the day and the month (the Moon’s period from full phase to full phase). How many days are there in a month? Can you figure out a scheme analogous to leap year to make this calendar work?arrow_forward
- Why is a sidereal day shorter than a solar day? O A. precession of Earth's axis B. the non-circular orbit of Earth around the Sun C. the tilt of Earth's axis D. the combined effect of the rotation of Earth and its orbit about the Sun E. Earth year being a non-integer number of Earth daysarrow_forwardWhen it is 12 noon in London, what is the standard time in Honolulu, Hawaii? I’m confused on how I find this answer on my own without a formula?arrow_forwardOn December 1, the first mate on a ship measures the altitude of the noonday Sun to be 54° to the south. What is the latitude of the ship? (Solve using L = ZA ± Sun degrees. Assume the winter solstice is on December 22 and the autumnal equinox is on September 22.)arrow_forward
- The 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_forwardWhich of the following is true for the Gregorian calendar? (15.5) (a) It is based on lunar months. (b) It is accurate to 1 day in 6000 years. (c) It has a leap year every century year that is divisible by 4. (d) It differs from the Julian calendar only in its name.arrow_forwardKEY TERMS 1. Cartesian coordinate system (15.1) 2. parallels (15.2) 3. meridians 4. great circle 5. latitude 6. longitude 7. Greenwich (prime) meridian 8. solar day (15.3) 9. sidereal day 10. Greenwich Mean Time (GMT) 11. Coordinated Universal Time (UTC) 12. International Date Line (IDL) 13. Daylight Saving Time (DST) 14. altitude (15.4) 15. zenith angle 16. summer solstice (15.5) 17. winter solstice 18. autumnal equinox 19. vernal equinox 20. tropical year 21. sidereal year 22. Gregorian calendar 23. precession (15.6) For each of the following items, fill in the number of the appropriate Key Term from the preceding list. a. _____ Zuluarrow_forward
- 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_forwardIn 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_forwardWhat are advantages and disadvantages of apparent solar time? How is the situation improved by introducing mean solar time and standard time?arrow_forward
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