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ASTRONOMY
PREPARED BY
MS. R. UMADEVI
ASSISTANT PROFESSOR OF
MATHEMATICS
BON SECOURS COLLEGE FOR
WOMEN
EXPLAIN THE TERM
VERTICALS
THE SECONDARIES TO THE
HORIZON ARE CALLED
VERTICAL CIRCLES OR
VERTICALS
CELESTIAL
MERIDIAN
THE GREAT CIRCLE THROUGH
THE CELESTIAL POLES, ZENITH
AND NADIR ARE CALLED THE
CELESTIAL MERIDIAN
NORTHERN HEMISPHERE
THE CELESTIAL EQUATOR DIVIDES THE
CELESTIAL SPHERE INTO TWO
HEMISPHERES. THE HEMISPHERE
CONTAINING THE NORTH POLE IS
CALLED THE NORTHERN HEMISPHERE.
CELESTIAL SPHERE
THE IMAGINARY SPHERE
SURROUNDING THE OBSERVER, ON
WHICH WE MAY SUPPOSE, THAT ALL
CELESTIAL BODIES ARE FIXED IS
CALLED THE CELESTIAL SPHERE.
ASTRONOMY
ASTRONOMY IS THE SCIENCE
DEALING WITH THE CELESTIAL
BODIES LIKE THE SUN, THE
MOON, THE PLANETS AND THE
STARS.
CELESTIAL MERIDIAN
THE GREAT CIRCLE THROUGH
THE CELESTIAL POLES,
ZENITH AND NADIR
CONNECXION
SPHERICAL TRIANGLE
LATITUDE
SIDEREAL TIMES
LONGITUDE
RIGHT ASCENSION
ECLIPSES
PHASES OF MOON

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