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Celestial Navigation | Marine Courses Center

celestial navigation | Concept of celestial sphere | astro navigation | part 1

celestial navigation | Concept of celestial sphere | astro navigation

 

 welcome to Marine Courses Center today we will talk about celestial navigation concept of celestial sphere for astro navigation

Concept of celestial sphere

Celestial equator ( Equinoctial )

Is the great circle on the celestial sphere, perpendicular to the axis of rotation and divides the celestial sphere into Northern and Southern hemispheres.


Celestial equator ( Equinoctial )

Celestial meridians

Celestial meridians

 Parallels of declination (Diurnal circle )

  Small circles on the celestial sphere, and parallel to the equinoctial.

Parallels of declination

 Concept of celestial sphere

Concept of celestial sphere Vertical circles 

Vertical circles
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 Observer’s meridian

Is the great circle on the celestial sphere passes through celestial poles, Zenith and Nadir points, it divides the celestial sphere into eastern and western hemispheres.

 it is divided into :-       PZP’    the upper observer‘s meridian

                                         PZ’P’   the lower observer’s meridian  

Observer’s meridian

Principal Vertical circle

Is the great circle on the celestial sphere passes through Zenith and Nadir points and  celestial poles.

Principal Vertical circle

Prime Vertical circle

Is the great circle on the celestial sphere passes through Zenith, Nadir, East and West points.
         (it is perpendicular to
Principal Vertical circle at zenith point)

Prime Vertical circle

The elevated pole represents the latitude
 of the observer

The elevated pole represents the latitude  of the observer
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