Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 14.2, Problem 1SC

In about twelve thousand years, the star Vega will be the North Star, not Polaris, because of Earth’s

  1. a. uneven equinox.
  2. b. tilted axis.
  3. c. precession.
  4. d. recession.
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Because of the precession of the Earth’s axis,   a. there are four seasons, spring, summer, fall, and winter.   b. the Earth receives more solar radiation in the summer than in the winter.   c. Polaris will not be the North Star in about 12,000 years.   d. the lengths of the Earth’s days and nights vary throughout the year.
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?
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