Pathways to Astronomy

Stephen E. Schneider

Chapter 9 Calendars - all with Video Answers

Educators

Chapter Questions

Problem 1

If the same year-numbering systems were used today as were used in Europe before 532 c.E., what year would we currently report?

David Collins

Numerade Educator

01:43

Problem 2

What year will 2050 c.E. be in the Chinese, Islamic, and Jewish calendar systems?

Carson Merrill

Numerade Educator

01:19

Suppose a 12 -month lunar calendar year (such as in the Islamic calendar) began on January 1. How many solar years would pass before the lunar calendar year would again begin within 1 week of January 1? How many lunar calendar years would have elapsed?

Carson Merrill

Numerade Educator

01:02

Problem 4

The first day of the month in the Islamic calendar begins when the crescent moon is first spotted. Usually the earliest this is possible is about 16 hours after the new moon. What is the angular distance between the Moon and the Sun at this time? Approximately how long after the Sun sets will the Moon set if it is just 16 hours past new?

Chris Johnson

Numerade Educator

00:55

Problem 5

Under the Julian calendar system, the year averages to 365.25 days after 4 years. In the Gregorian system, determine the average length of the year after 400 years. If a country needed to convert from the Julian to the Gregorian calendar now, how many days would it need to remove from the calendar?

Victor Salazar

Numerade Educator

02:06

Problem 6

Suppose the year were 365.170 days long. How would you design a pattern of leap years to make the average year length exactly match this value within a span of 1000 years?

Mayank Tripathi

Numerade Educator

Problem 1

Problem 2

Problem 3

Problem 4

Problem 5

Problem 6