EXPLORATIONS (VALUE EDITION)
EXPLORATIONS (VALUE EDITION)
9th Edition
ISBN: 9781265245849
Author: ARNY
Publisher: MCG
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Chapter 1, Problem 1TY

(1.1) If you are standing at Earth’s North Pole, which of the following will be directly overhead?

  1. (a) The celestial equator
  2. (b) The ecliptic
  3. (c) The zodiac
  4. (d) The north celestial pole
  5. (e) The Sun
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Right Ascension and Declination is a coordinate system for objects in the sky, and is analogous to longitude and latitude coordinates, respectively, for objects on Earth.  Right ascension (RA) coordinates are given in hours (h), minutes (m), and seconds (s).  Declination  (DEC) coordinates are given in degrees (°), arcminutes ('), and arcseconds ("). Sirius is the brightest star in the night sky.  Its RA and DEC coordinates are 6h 45 m 7.96 s and -16° 44' 78.6". Using unit conversion, find the RA coordinate only in hours and round the coordinate to 5 significant figures.
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?
Given that H 1, H 2 are the hour angles of a star of declination δ on the prime vertical west and at settingrespectively for an observer in north latitude, show thatcos H 1 cos H 2+ tan 2 δ = 0.

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EXPLORATIONS (VALUE EDITION)

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