10 Questions
What was TDT eventually shortened to?
Terrestrial Time (TT)
Which city uses sidereal time according to the text?
New York
For what years was the exact difference change in T = TD - UT deduced only from observations?
Years earlier than 1988
What value was used to correct the values earlier than 1955?
n' = -25.7376"/century$^2$ for the tidal acceleration of the Moon
What is sidereal time based on?
The positions of stars relative to the meridian
What is the hour angle of an object that crossed the meridian 3 hours ago?
3h
What is the convention for time by the stars based on?
The hour angle of the vernal equinox
What is the approximate length of a tropical year mentioned in the text?
365.25 days
Who introduced the calendar reform that added a leap year every 4 years?
Julius Caesar
What did Pope Gregory XIII's calendar reform in 1582 aim to correct?
The drift of the equinoxes and solstices
Test your knowledge on the features of celestial paths in the equatorial sky. Learn about how stars with different declinations rise, set, and reach their highest point based on their position on the celestial equator. Explore how the paths of stars vary in relation to the celestial equator and the observer's location.
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