Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 1, Problem 3TQ
(1.1) Can you think of an astronomical reason why the zodiac may have been divided into 12 signs rather than 8 or 16?
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2) Calculate the difference in the geostationary altitude ( in km ) by by using solar day (24 hrs) and sidereal day (23hrs 56mins and 41 secs)
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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?
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.
Chapter 1 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 1 - (1.1) What is the celestial sphere? What are the...Ch. 1 - (1.1) What is the difference between rotation and...Ch. 1 - (1.1/1.2) What is a constellation, and what is...Ch. 1 - (1.2) What causes the seasons?Ch. 1 - What causes the Moons phases?Ch. 1 - (1.3) How long does it take the Moon to go through...Ch. 1 - (1.2) Why does the position of sunrise along the...Ch. 1 - Why arent there eclipses each month?Ch. 1 - (1.1) If you were standing on Earths equator,...Ch. 1 - Prob. 2TQ
Ch. 1 - (1.1) Can you think of an astronomical reason why...Ch. 1 - Draw sketches to show the angles setting stars...Ch. 1 - Prob. 5TQCh. 1 - Prob. 6TQCh. 1 - (1.2) Why does the position of sunrise along the...Ch. 1 - (1.2) Why do we have time zones? Sketch and label...Ch. 1 - (1.3) Provide two or three pieces of evidence you...Ch. 1 - (1.3) If the Moon orbited Earth in the opposite...Ch. 1 - (1.1) If Earth turns one full rotation in...Ch. 1 - (1.2) From a latitude of 55, what is the highest...Ch. 1 - Prob. 3PCh. 1 - Prob. 4PCh. 1 - Prob. 5PCh. 1 - Prob. 6PCh. 1 - Prob. 7PCh. 1 - Prob. 8PCh. 1 - (1.1) If you are standing at Earths North Pole,...Ch. 1 - Prob. 2TYCh. 1 - Prob. 3TYCh. 1 - Prob. 4TYCh. 1 - (1.2) In which of the following locations can the...Ch. 1 - Prob. 6TYCh. 1 - (1.3) You observe the Moon rising at 6 p.m.,...Ch. 1 - (1.3) You observe the Moon rising at 3 p.m., a few...Ch. 1 - Prob. 9TYCh. 1 - (1.4) Figure 1.22 (right) shows an eclipse of the...Ch. 1 - (1.4) If the Moon were to expand to twice its...
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- Consider 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_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_forwardDescribe a practical way to determine in which constellation the Sun is found at any time of the year.arrow_forward
- Which of the following is not a contributing factor in causing eclipses? (17.2) (a) the rotation of the Earth about its axis (b) the inclination of the Moons orbit (c) the varying distance between the Earth and the Moon (d) the varying distance between the Earth and the Sunarrow_forwardWhat is the difference between a sidereal month and a synodic month? Which is longer? Why?arrow_forwardEx. 10 : What would have be the duration of the year if the distance between earth and sun were half the present distance ?arrow_forward
- 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.arrow_forwardWhat would be the answers to 15-17?arrow_forwardWhat would be duration of year, if distance Between earth & the sun got doubled? 10 129 days w 365 days (01) 500 days (iv) 1032 daysarrow_forward
- Where are you on Earth if you experience each of the following? (Refer to the discussion in Observing the Sky: The Birth of Astronomy as well as this chapter.) A. The stars rise and set perpendicular to the horizon. B. The stars circle the sky parallel to the horizon. C. The celestial equator passes through the zenith. D. In the course of a year, all stars are visible. E. The Sun rises on March 21 and does not set until September 21 (ideally).arrow_forwardWhy is it difficult to construct a practical calendar based on the Moon’s cycle of phases?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_forward
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