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Points and Circle of Reference
Any point on the earth's
surface is the direction of
Gravity at that point.
 The point above the observer that
is directly opposite the nadir on
the imaginary sphere against
which celestial bodies appear to
be projected. (Highest Point)
 The point below the observer that
is directly opposite the zenith on
the imaginary sphere against
which celestial bodies appear to
be projected. (Lowest Point)
The great circle on the
celestial sphere whose plane
passes through the sensible
horizon and the center of the
Earth.
Points and Circle of Reference
Great circles passing through the
zenith and nadir.
A circle on the sky parallel to
the horizon.
Points and Circle of Reference
One of two points of
intersection of the Earth's
axis and the celestial sphere.
Points and Circle of Reference
• An imaginary line around
the Earth forming the great
circle that is equidistant
from the north and south
poles.
• A circle dividing a sphere or
other surface into two
usually equal and
symmetrical parts.
Hour Circles are great circles
passing through the north and
south celestial poles .
PVP'
Points and Circle of Reference
Hour angle, in astronomy, the angle
between an observer’s meridian (a
great circle passing over his head and
through the celestial poles) and the
hour circle (any other great circle
passing through the poles) on which
some celestial body lies. This angle,
when expressed in hours and minutes,
is the time elapsed since the celestial
body’s last transit of the observer’s
meridian. The hour angle can also be
expressed in degrees, 15° of arc being
equal to one hour.
Points and Circle of Reference
• Circles parallel to the plane
of the Equator.
• (BKC)
An imaginary great circle on the
surface of the earth passing
through the north and south
poles at right angles to the
equator.
(SZ PL)
Vertical circle whose
Plane is Perpendicular
to the Plane of the
meridian.
(EZW)
• The great circle
representing the apparent
annual path of the sun.
• The plane of the Earth's
orbit around the sun.
• It makes an angle of about
23 degrees with the
equator.
Points and Circle of Reference
Points and Circle of Reference
Either of the two celestial points at
which the celestial equator intersects
the ecliptic.
Either of the two times of the year
when the sun is at its greatest
distance from the celestial equator.
Points and Circle of Reference
Points and Circle of Reference
Thank You

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Points and Circle of Reference

  • 2. Any point on the earth's surface is the direction of Gravity at that point.
  • 3.  The point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected. (Highest Point)  The point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected. (Lowest Point)
  • 4. The great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth.
  • 6. Great circles passing through the zenith and nadir.
  • 7. A circle on the sky parallel to the horizon.
  • 9. One of two points of intersection of the Earth's axis and the celestial sphere.
  • 11. • An imaginary line around the Earth forming the great circle that is equidistant from the north and south poles. • A circle dividing a sphere or other surface into two usually equal and symmetrical parts.
  • 12. Hour Circles are great circles passing through the north and south celestial poles . PVP'
  • 14. Hour angle, in astronomy, the angle between an observer’s meridian (a great circle passing over his head and through the celestial poles) and the hour circle (any other great circle passing through the poles) on which some celestial body lies. This angle, when expressed in hours and minutes, is the time elapsed since the celestial body’s last transit of the observer’s meridian. The hour angle can also be expressed in degrees, 15° of arc being equal to one hour.
  • 16. • Circles parallel to the plane of the Equator. • (BKC)
  • 17. An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator. (SZ PL)
  • 18. Vertical circle whose Plane is Perpendicular to the Plane of the meridian. (EZW)
  • 19. • The great circle representing the apparent annual path of the sun. • The plane of the Earth's orbit around the sun. • It makes an angle of about 23 degrees with the equator.
  • 22. Either of the two celestial points at which the celestial equator intersects the ecliptic.
  • 23. Either of the two times of the year when the sun is at its greatest distance from the celestial equator.