Celestial Paths Quiz: Equatorial Sky Features
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Questions and Answers

What was TDT eventually shortened to?

  • Mean Solar Time (MST)
  • Terrestrial Time (TT) (correct)
  • Universal Time (UT)
  • Sidereal Time (ST)

    • Which city uses sidereal time according to the text?

  • Rome
  • New York (correct)
  • Moscow
  • London

    • For what years was the exact difference change in T = TD - UT deduced only from observations?

  • Years later than 1988
  • Years earlier than 1955
  • Years earlier than 1988 (correct)
  • Years later than 1955

    • What value was used to correct the values earlier than 1955?

    <p>n' = -25.7376&quot;/century$^2$ for the tidal acceleration of the Moon</p> Signup and view all the answers

    What is sidereal time based on?

    <p>The positions of stars relative to the meridian</p> Signup and view all the answers

    What is the hour angle of an object that crossed the meridian 3 hours ago?

    <p>3h</p> Signup and view all the answers

    What is the convention for time by the stars based on?

    <p>The hour angle of the vernal equinox</p> Signup and view all the answers

    What is the approximate length of a tropical year mentioned in the text?

    <p>365.25 days</p> Signup and view all the answers

    Who introduced the calendar reform that added a leap year every 4 years?

    <p>Julius Caesar</p> Signup and view all the answers

    What did Pope Gregory XIII's calendar reform in 1582 aim to correct?

    <p>The drift of the equinoxes and solstices</p> Signup and view all the answers

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