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Positional Astronomy

Positional Astronomy. Multiple Choice Questions. Test Question. Does this quiz work? A. Yes B. No. Positional Astronomy.

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Positional Astronomy

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  1. Positional Astronomy Multiple Choice Questions

  2. Test Question Does this quiz work? A. Yes B. No

  3. Positional Astronomy • 1. An arc of length ‘S’ is a section of the circumference of a circle of radius ‘r’ and S subtends the angle θ. Which of the following is the correct relation between S, r and θ? • θ = S/r in radians. Y • θ = r/S in degrees. • θ = S/r in degrees. • θ = r/S in radians.

  4. Positional Astronomy • 2. Which of the following is a correct statement? • Both longitude and latitude lines are great circle arcs. • Both longitude and latitude lines are small circle lines. • Longitude lines are great circle arcs and latitude lines are small circle lines. y • Longitude lines are small circle lines and latitude lines are great circle arcs.

  5. Positional Astronomy • 3. Which of the following is a correct statement? • Longitude measurements are positive for points west of the Greenwich Meridian and negative for points east of it. • Longitude measurements are positive for points east of the Greenwich Meridian and negative for points west of it. y • Latitude measurements are positive for points west of the Greenwich Meridian and negative for points east of it. • Longitude measurements are positive for points east of the Greenwich Meridian and negative for points west of it.

  6. Positional Astronomy • 4. What is the definition of the nautical term ‘knot’? • One knot is the time it takes to travel one nautical mile. • One knot is double the rate of 3 nautical miles per 6 hours. Y • One knot is half the rate of 3 nautical miles per hour. • One knot is the time it takes to travel one mile.

  7. Positional Astronomy • 5. If a star has a parallax angle of 0.25”, how far away is it? • 0.25 parsecs. y • 0.25 AU. • 4 parsecs. • 4 AU.

  8. Positional Astronomy • 6. In what direction do the stars appear to move around Polaris? • Clockwise. • Anti-clockwise. y

  9. Positional Astronomy • 7. The vernal equinox is defined by… • A time when there are lots of druids at Stonehenge. • The date when the sun is at the zenith of a point at the equator in Autumn. • The date in spring when the sun is at the zenith of the point halfway between the tropic of cancer and the equator. • The date in spring when the sun is at the zenith of a point at the equator. y

  10. Positional Astronomy • 8. In the Alt-Az coordinate system where are the respective coordinates measured from? • Altitude measured from North Point, Azimuth measured in the fundamental plane from the observer’s horizon. • Altitude measured from Celestial equator, Azimuth measured in the fundamental plane from the observer’s horizon. • Altitude measured from celestial equator, Azimuth measured in the fundamental plane from the Greenwich Meridian. • Altitude measured from observers horizon, Azimuth measured eastwards from the observer’s meridian. y

  11. Positional Astronomy • 9. Right ascension could replace Hour Angle in the HA-dec system to produce another meaning full coordinate system, true or false? • True. y • False. • Not enough information to tell.

  12. Positional Astronomy • 10. A woman walks due east from Glasgow and after a long time arrives back exactly where she originally started. What could her path be called? • A great circle arc. • A pilgrimage to Inverness. • A small circle. y • None of the above.

  13. Positional Astronomy • 11. In the spherical sine formula, all of the denominators can be switched around with all of the numerators and still make sense, true or false? • True. y • False.

  14. Positional Astronomy • 12. Which is a correct expression for the spherical cosine formula? • Cos(a) = cos(b)cos(a) + sin(b)sin(C)cos(A). • Cos(a) = cos(a)cos(c) + sin(b)cos(C)cos(A). • Cos(a) = sin(b)sin(c) + sin(b)sin(c)cos(A). • None of the above. y • All of the above.

  15. Positional Astronomy • 13. The Sun’s diurnal path is exactly 180 degrees whatever the time of year for a stationary observer, true or false? • True. • False. y

  16. Positional Astronomy • 14. Which of these statements is FALSE? • Sundials would quickly go out of sink if they were compared with an accurate watch. • None of these are false. y • The days are longer in summer than they are in winter. • The ecliptic isn’t parallel to the celestial equator.

  17. Positional Astronomy • 15. Which is longer, the sidereal day or the solar day? • Sidereal day. • Solar day. y • They are both the same.

  18. Positional Astronomy • 16. The solar day is how much longer than the sidereal day and why? • 4 minutes longer because the earth has moved about 1 degree further on its orbit. y • 5 minutes longer because the earth has moved about 1 degree further on its orbit. • 4 minutes longer because the original measurements on the length of a day when the Gregorian calendar was created were not as accurate as present day measurements. • 5 minutes longer because the original measurements on the length of a day when the Gregorian calendar was created were not as accurate as present day measurements.

  19. Positional Astronomy • 17. What is the correct form of the equation of time? • Equation of time = RA (mean Sun) – RA (true Sun). Y • Equation of time = HA (mean Sun) – RA (true Sun). • Equation of time = RA (true Sun) – RA (mean Sun). • Equation of time = HA (true Sun) – RA (mean Sun).

  20. Positional Astronomy • 18. Which is longer the sidereal year or the tropical year? • Sidereal year. Y • Tropical year. • They are both the same.

  21. Positional Astronomy • 19. Which statement about the moon is FALSE? • The Moon has one side which is never viewable from earth. • The Moon takes one sidereal month to orbit the Earth. • The Moon has a permanent dark side. y • The Moon’s orbit isn’t aligned with the ecliptic.

  22. Positional Astronomy • 20. Which statement about planetary configurations FALSE? • An inferior planet on the observer’s meridian at midnight is in opposition. • A superior planet can never be in opposition. • A planet lying in the same direction as the Sun is said to be in opposition. • An inferior planet can be in superior or inferior conjunction. y

  23. Positional Astronomy • 21. Which statement about planetary configurations is FALSE? • An superior planet can have an elongation between 0 and 180 degrees. • Quadrature is when the elongation of a superior planet is 90 degrees. • Quadrature is when the elongation of an inferior planet is 90 degrees. Y • An inferior planet has zero elongation when in conjunction.

  24. Positional Astronomy • 22. Which is the correct definition of phase? • The angle defined at the Sun between the Earth, the planet and the Sun. • The angle defined at the Planet between the Earth, the planet and the Sun. y • The angle defined at the Earth between the Earth, the planet and the Sun. • None of the above.

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