hour circle Antonyms
No Synonyms and anytonyms found
Meaning of hour circle
Wordnet
hour circle (n)
a great circle on the celestial sphere that passes through both celestial poles
hour circle Sentence Examples
- The hour circle passing through the zenith marks the celestial meridian.
- The zenith is directly above the observer on the hour circle that intersects the prime vertical.
- Observers at different longitudes share the same hour circle at a given instant.
- The angle between two hour circles is equal to the difference in longitude between the points where they intersect the celestial equator.
- Celestial objects move along hour circles as the Earth rotates on its axis.
- The right ascension of a celestial body is the angle between its hour circle and the vernal equinox.
- Determining the altitude of a star requires knowing its declination and the hour circle it is on.
- Navigators use hour circles to determine their longitude by measuring the time difference between when a celestial body crosses the meridian and when it crosses the observer's hour circle.
- Astronomers often use the hour circle coordinate system to plot the positions of celestial objects on star charts.
- The rotation of the Earth can be visualized as the movement of an infinite number of hour circles around the celestial poles.
FAQs About the word hour circle
a great circle on the celestial sphere that passes through both celestial poles
No synonyms found.
No antonyms found.
The hour circle passing through the zenith marks the celestial meridian.
The zenith is directly above the observer on the hour circle that intersects the prime vertical.
Observers at different longitudes share the same hour circle at a given instant.
The angle between two hour circles is equal to the difference in longitude between the points where they intersect the celestial equator.
